Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller LQFP 48 (7x7) 16/32-Bit 55 MHz I/O number 21

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Table Of Contents

Features
1. Description
- 1.1 Configuration Summary of the SAM7S512, SAM7S256, SAM7S128, SAM7S64, SAM7S321, SAM7S32, SAM7S161 and SAM7S16
2. Block Diagram
3. Signal Description
4. Package and Pinout
- 4.1 64-lead LQFP and 64-pad QFN Package Outlines
- 4.2 64-lead LQFP and 64-pad QFN Pinout
- 4.3 48-lead LQFP and 48-pad QFN Package Outlines
- 4.4 48-lead LQFP and 48-pad QFN Pinout
5. Power Considerations
- 5.1 Power Supplies
- 5.2 Power Consumption
- 5.3 Voltage Regulator
- 5.4 Typical Powering Schematics
6. I/O Lines Considerations
- 6.1 JTAG Port Pins
- 6.2 Test Pin
- 6.3 Reset Pin
- 6.4 ERASE Pin
- 6.5 PIO Controller A Lines
- 6.6 I/O Line Drive Levels
7. Processor and Architecture
- 7.1 ARM7TDMI Processor
- 7.2 Debug and Test Features
- 7.3 Memory Controller
- 7.4 Peripheral DMA Controller
8. Memories
- 8.1 SAM7S512
- 8.2 SAM7S256
- 8.3 SAM7S128
- 8.4 SAM7S64
- 8.5 SAM7S321/32
- 8.6 SAM7S161/16
- 8.7 Memory Mapping
- 8.8 Embedded Flash
- 8.9 Fast Flash Programming Interface
- 8.10 SAM-BA Boot Assistant
9. System Controller
- 9.1 Reset Controller
  - 9.1.1 Brownout Detector and Power-on Reset
- 9.2 Clock Generator
- 9.3 Power Management Controller
- 9.4 Advanced Interrupt Controller
- 9.5 Debug Unit
- 9.6 Periodic Interval Timer
- 9.7 Watchdog Timer
- 9.8 Real-time Timer
- 9.9 PIO Controller
- 9.10 Voltage Regulator Controller
10. Peripherals
- 10.1 User Interface
- 10.2 Peripheral Identifiers
- 10.3 Peripheral Multiplexing on PIO Lines
- 10.4 PIO Controller A Multiplexing
- 10.5 Serial Peripheral Interface
- 10.6 Two-wire Interface
- 10.7 USART
- 10.8 Serial Synchronous Controller
- 10.9 Timer Counter
- 10.10 PWM Controller
- 10.11 USB Device Port (Does not pertain to SAM7S32/16)
- 10.12 Analog-to-digital Converter
11. ARM7TDMI Processor Overview
- 11.1 Overview
- 11.2 ARM7TDMI Processor
12. Debug and Test Features
- 12.1 Description
- 12.2 Block Diagram
- 12.3 Application Examples
  - 12.3.1 Debug Environment
  - 12.3.2 Test Environment
- 12.4 Debug and Test Pin Description
- 12.5 Functional Description
13. Reset Controller (RSTC)
- 13.1 Overview
- 13.2 Block Diagram
- 13.3 Functional Description
- 13.4 Reset Controller (RSTC) User Interface
14. Real-time Timer (RTT)
- 14.1 Overview
- 14.2 Block Diagram
- 14.3 Functional Description
- 14.4 Real-time Timer (RTT) User Interface
15. Periodic Interval Timer (PIT)
- 15.1 Overview
- 15.2 Block Diagram
- 15.3 Functional Description
- 15.4 Periodic Interval Timer (PIT) User Interface
16. Watchdog Timer (WDT)
- 16.1 Overview
- 16.2 Block Diagram
- 16.3 Functional Description
- 16.4 Watchdog Timer (WDT) User Interface
17. Voltage Regulator Mode Controller (VREG)
- 17.1 Overview
- 17.2 Voltage Regulator Power Controller (VREG) User Interface
  - 17.2.1 Voltage Regulator Mode Register
18. Memory Controller (MC)
- 18.1 Overview
- 18.2 Block Diagram
- 18.3 Functional Description
- 18.4 Memory Controller (MC) User Interface
19. Embedded Flash Controller (EFC)
- 19.1 Overview
- 19.2 Functional Description
- 19.3 Embedded Flash Controller (EFC) User Interface
20. Fast Flash Programming Interface (FFPI)
- 20.1 Overview
- 20.2 Parallel Fast Flash Programming
- 20.3 Serial Fast Flash Programming
21. SAM7 Boot Program
- 21.1 Description
- 21.2 Flow Diagram
- 21.3 Device Initialization with USB
- 21.4 Device Initialization without USB
- 21.5 SAM-BA Boot
- 21.6 Hardware and Software Constraints
22. Peripheral DMA Controller (PDC)
- 22.1 Overview
- 22.2 Block Diagram
- 22.3 Functional Description
- 22.4 Peripheral DMA Controller (PDC) User Interface
23. Advanced Interrupt Controller (AIC)
- 23.1 Overview
- 23.2 Block Diagram
- 23.3 Application Block Diagram
- 23.4 AIC Detailed Block Diagram
- 23.5 I/O Line Description
- 23.6 Product Dependencies
- 23.7 Functional Description
- 23.8 Advanced Interrupt Controller (AIC) User Interface
24. Clock Generator
- 24.1 Overview
- 24.2 Slow Clock RC Oscillator
- 24.3 Main Oscillator
- 24.4 Divider and PLL Block
  - 24.4.1 PLL Filter
  - 24.4.2 Divider and Phase Lock Loop Programming
25. Power Management Controller (PMC)
- 25.1 Description
- 25.2 Master Clock Controller
- 25.3 Processor Clock Controller
- 25.4 USB Clock Controller
- 25.5 Peripheral Clock Controller
- 25.6 Programmable Clock Output Controller
- 25.7 Programming Sequence
- 25.8 Clock Switching Details
  - 25.8.1 Master Clock Switching Timings
  - 25.8.2 Clock Switching Waveforms
- 25.9 Power Management Controller (PMC) User Interface
26. Debug Unit (DBGU)
- 26.1 Overview
- 26.2 Block Diagram
- 26.3 Product Dependencies
- 26.4 UART Operations
- 26.5 Debug Unit (DBGU) User Interface
27. Parallel Input/Output Controller (PIO)
- 27.1 Overview
- 27.2 Block Diagram
- 27.3 Product Dependencies
- 27.4 Functional Description
- 27.5 I/O Lines Programming Example
- 27.6 Programmable Multibit ECC Error Location (PIO) User Interface
28. Serial Peripheral Interface (SPI)
- 28.1 Overview
- 28.2 Block Diagram
- 28.3 Application Block Diagram
- 28.4 Signal Description
- 28.5 Product Dependencies
- 28.6 Functional Description
- 28.7 Serial Peripheral Interface (SPI) User Interface User Interface
29. Two-wire Interface (TWI) SAM7S512/256/128/64/321/32
- 29.1 Overview
- 29.2 List of Abbreviations
- 29.3 Block Diagram
- 29.4 Application Block Diagram
  - 29.4.1 I/O Lines Description
- 29.5 Product Dependencies
- 29.6 Functional Description
- 29.7 Two-wire Interface (TWI) User Interface
30. Two Wire Interface (TWI) SAM7S161/16
- 30.1 Overview
- 30.2 List of Abbreviations
- 30.3 Block Diagram
- 30.4 Application Block Diagram
  - 30.4.1 I/O Lines Description
- 30.5 Product Dependencies
- 30.6 Functional Description
  - 30.6.1 Transfer Format
  - 30.6.2 Modes of Operation
- 30.7 Master Mode
- 30.8 Multi-master Mode
  - 30.8.1 Definition
  - 30.8.2 Different Multi-master Modes
    - 30.8.2.1 TWI as Master Only
    - 30.8.2.2 TWI as Master or Slave
- 30.9 Slave Mode
- 30.10 Two-wire Interface (TWI) User Interface
31. Universal Synchronous Asynchronous Receiver Transceiver (USART)
- 31.1 Overview
- 31.2 Block Diagram
- 31.3 Application Block Diagram
- 31.4 I/O Lines Description
- 31.5 Product Dependencies
- 31.6 Functional Description
- 31.7 Universal Synchronous Asynchronous Receiver Transmitter (USART) User Interface
32. Synchronous Serial Controller (SSC)
- 32.1 Description
- 32.2 Block Diagram
- 32.3 Application Block Diagram
- 32.4 Pin Name List
- 32.5 Product Dependencies
- 32.6 Functional Description
- 32.7 SSC Application Examples
- 32.8 Syncrhronous Serial Controller (SSC) User Interface
33. Timer Counter (TC)
- 33.1 Overview
- 33.2 Block Diagram
- 33.3 Pin Name List
- 33.4 Product Dependencies
- 33.5 Functional Description
- 33.6 Timer Counter (TC) User Interface
34. Pulse Width Modulation Controller (PWM)
- 34.1 overview
- 34.2 Block Diagram
- 34.3 I/O Lines Description
- 34.4 Product Dependencies
- 34.5 Functional Description
- 34.6 Pulse Width Modulation Controller (PWM) User Interface
35. USB Device Port (UDP)
- 35.1 Overview
- 35.2 Block Diagram
- 35.3 Product Dependencies
- 35.4 Typical Connection
  - 35.4.1 USB Device Transceiver
  - 35.4.2 VBUS Monitoring
- 35.5 Functional Description
- 35.6 USB Device Port (UDP) User Interface
36. Analog-to-Digital Converter (ADC)
- 36.1 Overview
- 36.2 Block Diagram
- 36.3 Signal Description
- 36.4 Product Dependencies
- 36.5 Functional Description
- 36.6 Analog-to-Digital Converter (ADC) User Interface
37. SAM7S Electrical Characteristics
- 37.1 Absolute Maximum Ratings
- 37.2 DC Characteristics
- 37.3 Power Consumption
  - 37.3.1 Power Consumption Versus Modes
  - 37.3.2 Peripheral Power Consumption in Active Mode
- 37.4 Crystal Oscillators Characteristics
- 37.5 PLL Characteristics
- 37.6 Master Clock Characteristics
- 37.7 I/O Characteristics
- 37.8 USB Transceiver Characteristics
  - 37.8.1 Electrical Characteristics
  - 37.8.2 Switching Characteristics
- 37.9 ADC Characteristics
- 37.10 AC Characteristics
38. Mechanical Characteristics
- 38.1 Package Drawings
- 38.2 LQFP Packages
- 38.3 QFN Packages
- 38.4 Soldering Profile
39. SAM7S Ordering Information
40. Errata
- 40.1 Marking
- 40.2 Errata Summary by Product and Revision or Manufacturing Number
- 40.3 Errata Organization by Product and Revision or Manufacturing Number
- 40.4 SAM7S512 Errata - Revision A Parts
  - 40.4.1 Analog-to-Digital Converter (ADC)
  - 40.4.2 Embedded Flash Controller (EFC)
    - 40.4.2.1 EFC: Embedded Flash Access Time 1
  - 40.4.3 Parallel Input/Output Controller (PIO)
  - 40.4.4 Pulse Width Modulation Controller (PWM)
  - 40.4.5 Real Time Timer (RTT)
    - 40.4.5.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.4.6 Serial Peripheral Interface (SPI)
  - 40.4.7 Synchronous Serial Controller (SSC)
  - 40.4.8 Two-wire Interface (TWI)
  - 40.4.9 Universal Synchronous Asynchronous Receiver Transmitter (USART)
- 40.5 SAM7S512 Errata - Revision B Parts
  - 40.5.1 Analog-to-Digital Converter (ADC)
  - 40.5.2 Embedded Flash Controller (EFC)
    - 40.5.2.1 EFC: Embedded Flash Access Time 2
  - 40.5.3 Parallel Input/Output Controller (PIO)
  - 40.5.4 Pulse Width Modulation Controller (PWM)
  - 40.5.5 Real Time Timer (RTT)
    - 40.5.5.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.5.6 Serial Peripheral Interface (SPI)
  - 40.5.7 Synchronous Serial Controller (SSC)
  - 40.5.8 Two-wire Interface (TWI)
  - 40.5.9 Universal Synchronous Asynchronous Receiver Transmitter (USART)
- 40.6 SAM7S256 Errata - Manufacturing Number 58818C
  - 40.6.1 Chip ID
    - 40.6.1.1 Wrong Chip ID Value
  - 40.6.2 Analog-to-Digital Converter (ADC)
  - 40.6.3 Master Clock (MCK)
    - 40.6.3.1 MCK: Limited Master Clock Frequency Ranges
  - 40.6.4 Non Volatile Memory Bits (NVM Bits)
    - 40.6.4.1 NVM Bits: Write/Erase Cycles Number
  - 40.6.5 Parallel Input/Output Controller (PIO)
  - 40.6.6 Power Management Controller (PMC)
    - 40.6.6.1 PMC: Slow Clock Selected in PMC and a Transition Occurs on PA1
    - 40.6.6.2 PMC: Programming CSS in PMC_MCKR Register
  - 40.6.7 Pulse Width Modulation Controller (PWM)
  - 40.6.8 Real Time Timer (RTT)
    - 40.6.8.1 RTT: Possible Event Loss when Reading RTT_SR
    - 40.6.8.2 RTT: RTT_VR May be Corrupted
  - 40.6.9 Serial Peripheral Interface (SPI)
  - 40.6.10 Synchronous Serial Controller (SSC)
  - 40.6.11 Two-wire Interface (TWI)
  - 40.6.12 Universal Synchronous Asynchronous Receiver Transmitter (USART)
  - 40.6.13 Voltage Regulator
    - 40.6.13.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.6.13.2 Voltage Regulator: Load Versus Temperature
  - 40.6.14 Watchdog Timer (WDT)
    - 40.6.14.1 WDT: The Watchdog Timer May Lock the Device in a Reset State
    - 40.6.14.2 WDT: The Watchdog Timer Status Register and Interrupt
- 40.7 SAM7S256 Errata - Revision A Parts
  - 40.7.1 Chip ID
    - 40.7.1.1 Wrong Chip ID Value
  - 40.7.2 Analog-to-Digital Converter (ADC)
  - 40.7.3 Non Volatile Memory Bits (NVM Bits)
    - 40.7.3.1 NVM Bits: Write/Erase Cycles Number
  - 40.7.4 Parallel Input/Output Controller (PIO)
  - 40.7.5 Power Management Controller (PMC)
    - 40.7.5.1 PMC: Slow Clock Selected in PMC and a Transition Occurs on PA1
    - 40.7.5.2 PMC: Programming CSS in PMC_MCKR Register
  - 40.7.6 Pulse Width Modulation Controller (PWM)
  - 40.7.7 Real Time Timer (RTT)
    - 40.7.7.1 RTT: Possible Event Loss when Reading RTT_SR
    - 40.7.7.2 RTT: RTT_VR May be Corrupted
  - 40.7.8 Serial Peripheral Interface (SPI)
  - 40.7.9 Synchronous Serial Controller (SSC)
  - 40.7.10 Two-wire Interface (TWI)
  - 40.7.11 Universal Synchronous Asynchronous Receiver Transmitter (USART)
  - 40.7.12 Voltage Regulator
    - 40.7.12.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.7.12.2 Voltage Regulator: Load Versus Temperature
  - 40.7.13 Watchdog Timer (WDT)
    - 40.7.13.1 WDT: The Watchdog Timer May Lock the Device in a Reset State
    - 40.7.13.2 WDT: The Watchdog Timer Status Register and Interrupt
- 40.8 SAM7S256 Errata - Revision B Parts
  - 40.8.1 Analog-to-Digital Converter (ADC)
  - 40.8.2 Non Volatile Memory Bits (NVM Bits)
    - 40.8.2.1 NVM Bits: Write/Erase Cycles Number
  - 40.8.3 Parallel Input/Output Controller (PIO)
    - 40.8.3.1 PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
    - 40.8.3.2 PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
  - 40.8.4 Pulse Width Modulation Controller (PWM)
  - 40.8.5 Real Time Timer (RTT)
    - 40.8.5.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.8.6 Serial Peripheral Interface (SPI)
  - 40.8.7 Synchronous Serial Controller (SSC)
  - 40.8.8 Two-wire Interface (TWI)
  - 40.8.9 Universal Synchronous Asynchronous Receiver Transmitter (USART)
  - 40.8.10 Voltage Regulator
    - 40.8.10.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.8.10.2 Voltage Regulator: Load Versus Temperature
- 40.9 SAM7S256 Errata - Revision C Parts
  - 40.9.1 Embedded Flash Controller (EFC)
    - 40.9.1.1 EFC: Embedded Flash Access Time 1
  - 40.9.2 Parallel Input/Output Controller (PIO)
    - 40.9.2.1 PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
    - 40.9.2.2 PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
  - 40.9.3 Pulse Width Modulation Controller (PWM)
  - 40.9.4 Real Time Timer (RTT)
    - 40.9.4.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.9.5 USART: Universal Synchronous Asynchronous Receiver Transmitter
    - 40.9.5.1 USART: DCD is active High instead of Low
- 40.10 SAM7S256 Errata - Revision D Parts
  - 40.10.1 Embedded Flash Controller (EFC)
    - 40.10.1.1 EFC: Embedded Flash Access Time 1
  - 40.10.2 Parallel Input/Output Controller (PIO)
    - 40.10.2.1 PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
    - 40.10.2.2 PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
  - 40.10.3 Pulse Width Modulation Controller (PWM)
  - 40.10.4 Real Time Timer (RTT)
    - 40.10.4.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.10.5 USART: Universal Synchronous Asynchronous Receiver Transmitter
    - 40.10.5.1 USART: DCD is active High instead of Low
- 40.11 SAM7S128 Errata - Manufacturing Number 58818C
  - 40.11.1 Chip ID
    - 40.11.1.1 Wrong Chip ID Value
  - 40.11.2 Analog-to-Digital Converter (ADC)
  - 40.11.3 Master Clock (MCK)
    - 40.11.3.1 MCK: Limited Master Clock Frequency Ranges
  - 40.11.4 Non Volatile Memory Bits (NVM Bits)
    - 40.11.4.1 NVM Bits: Write/Erase Cycles Number
  - 40.11.5 Parallel Input/Output Controller (PIO)
  - 40.11.6 Power Management Controller (PMC)
    - 40.11.6.1 PMC: Slow Clock Selected in PMC and a Transition Occurs on PA1
    - 40.11.6.2 PMC: Programming CSS in PMC_MCKR Register
  - 40.11.7 Pulse Width Modulation Controller (PWM)
  - 40.11.8 Real Time Timer (RTT)
    - 40.11.8.1 RTT: Possible Event Loss when Reading RTT_SR
    - 40.11.8.2 RTT: RTT_VR May be Corrupted
  - 40.11.9 Serial Peripheral Interface (SPI)
  - 40.11.10 Synchronous Serial Controller (SSC)
  - 40.11.11 Two-wire Interface (TWI)
  - 40.11.12 USART: Universal Synchronous Asynchronous Receiver Transmitter
  - 40.11.13 Voltage Regulator
    - 40.11.13.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.11.13.2 Voltage Regulator: Load Versus Temperature
  - 40.11.14 Watchdog Timer (WDT)
    - 40.11.14.1 WDT: The Watchdog Timer May Lock the Device in a Reset State
    - 40.11.14.2 WDT: The Watchdog Timer Status Register and Interrupt
- 40.12 SAM7S128 Errata - Revision A Parts
  - 40.12.1 Chip ID
    - 40.12.1.1 Wrong Chip ID Value
  - 40.12.2 Analog-to-Digital Converter (ADC)
  - 40.12.3 Non Volatile Memory Bits (NVM Bits)
    - 40.12.3.1 NVM Bits: Write/Erase Cycles Number
  - 40.12.4 Parallel Input/Output Controller (PIO)
  - 40.12.5 Power Management Controller (PMC)
    - 40.12.5.1 PMC: Slow Clock Selected in PMC and a Transition Occurs on PA1
    - 40.12.5.2 PMC: Programming CSS in PMC_MCKR Register
  - 40.12.6 Pulse Width Modulation Controller (PWM)
  - 40.12.7 Real Time Timer (RTT)
    - 40.12.7.1 RTT: Possible Event Loss when Reading RTT_SR
    - 40.12.7.2 RTT: RTT_VR May be Corrupted
  - 40.12.8 Serial Peripheral Interface (SPI)
  - 40.12.9 Synchronous Serial Controller (SSC)
  - 40.12.10 Two-wire Interface (TWI)
  - 40.12.11 USART: Universal Synchronous Asynchronous Receiver Transmitter
  - 40.12.12 Voltage Regulator
    - 40.12.12.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.12.12.2 Voltage Regulator: Load Versus Temperature
  - 40.12.13 Watchdog Timer (WDT)
    - 40.12.13.1 WDT: The Watchdog Timer May Lock the Device in a Reset State
    - 40.12.13.2 WDT: The Watchdog Timer Status Register and Interrupt
- 40.13 SAM7S128 Errata - Revision B Parts
  - 40.13.1 Analog-to-Digital Converter (ADC)
  - 40.13.2 Non Volatile Memory Bits (NVM Bits)
    - 40.13.2.1 NVM Bits: Write/Erase Cycles Number
  - 40.13.3 Parallel Input/Output Controller (PIO)
    - 40.13.3.1 PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
    - 40.13.3.2 PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
  - 40.13.4 Pulse Width Modulation Controller (PWM)
  - 40.13.5 Real Time Timer (RTT)
    - 40.13.5.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.13.6 Serial Peripheral Interface (SPI)
  - 40.13.7 Synchronous Serial Controller (SSC)
  - 40.13.8 Two-wire Interface (TWI)
  - 40.13.9 USART: Universal Synchronous Asynchronous Receiver Transmitter
  - 40.13.10 Voltage Regulator
    - 40.13.10.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.13.10.2 Voltage Regulator: Load Versus Temperature
- 40.14 SAM7S128 Errata - Revision C Parts
  - 40.14.1 Embedded Flash Controller (EFC)
    - 40.14.1.1 EFC: Embedded Flash Access Time 1
  - 40.14.2 Parallel Input/Output Controller (PIO)
    - 40.14.2.1 PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
    - 40.14.2.2 PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
  - 40.14.3 Pulse Width Modulation Controller (PWM)
  - 40.14.4 Real Time Timer (RTT)
    - 40.14.4.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.14.5 USART: Universal Synchronous Asynchronous Receiver Transmitter
    - 40.14.5.1 USART: DCD is active High instead of Low
- 40.15 SAM7S128 Errata - Revision D Parts
  - 40.15.1 Embedded Flash Controller (EFC)
    - 40.15.1.1 EFC: Embedded Flash Access Time 1
  - 40.15.2 Parallel Input/Output Controller (PIO)
    - 40.15.2.1 PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
    - 40.15.2.2 PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
  - 40.15.3 Pulse Width Modulation Controller (PWM)
  - 40.15.4 Real Time Timer (RTT)
    - 40.15.4.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.15.5 USART: Universal Synchronous Asynchronous Receiver Transmitter
    - 40.15.5.1 USART: DCD is active High instead of Low
- 40.16 SAM7S64 Errata - Manufacturing Number 58814G
  - 40.16.1 Analog-to-Digital Converter (ADC)
  - 40.16.2 JTAG
    - 40.16.2.1 JTAG: Recommendation for TDI Pin
  - 40.16.3 Master Clock (MCK)
    - 40.16.3.1 MCK: Limited Master Clock Frequency Ranges
  - 40.16.4 Non Volatile Memory Bits (NVM Bits)
    - 40.16.4.1 NVM Bits: Write/Erase Cycles Number
  - 40.16.5 Parallel Input/Output Controller (PIO)
  - 40.16.6 Pulse Width Modulation Controller (PWM)
  - 40.16.7 Real Time Timer (RTT)
    - 40.16.7.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.16.8 Serial Peripheral Interface (SPI)
  - 40.16.9 Synchronous Serial Controller (SSC)
  - 40.16.10 Two-wire Interface (TWI)
  - 40.16.11 Universal Synchronous Asynchronous Receiver Transmitter (USART)
  - 40.16.12 Voltage Regulator
    - 40.16.12.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.16.12.2 Voltage Regulator: Load Versus Temperature
- 40.17 SAM7S64 Errata - Revision A Parts
  - 40.17.1 Analog-to-Digital Converter (ADC)
  - 40.17.2 Non Volatile Memory Bits (NVM Bits)
    - 40.17.2.1 NVM Bits: Write/Erase Cycles Number
  - 40.17.3 Parallel Input/Output Controller (PIO)
  - 40.17.4 Pulse Width Modulation Controller (PWM)
  - 40.17.5 Real Time Timer (RTT)
    - 40.17.5.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.17.6 Serial Peripheral Interface (SPI)
  - 40.17.7 Synchronous Serial Controller (SSC)
  - 40.17.8 Two-wire Interface (TWI)
  - 40.17.9 Universal Synchronous Asynchronous Receiver Transmitter (USART)
  - 40.17.10 Voltage Regulator
    - 40.17.10.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.17.10.2 Voltage Regulator: Load Versus Temperature
- 40.18 SAM7S64 Errata - Revision B Parts
  - 40.18.1 Analog-to-Digital Converter (ADC)
  - 40.18.2 Non Volatile Memory Bits (NVM Bits)
    - 40.18.2.1 NVM Bits: Write/Erase Cycles Number
  - 40.18.3 Parallel Input/Output Controller (PIO)
    - 40.18.3.1 PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
    - 40.18.3.2 PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
  - 40.18.4 Pulse Width Modulation Controller (PWM)
  - 40.18.5 Real Time Timer (RTT)
    - 40.18.5.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.18.6 Serial Peripheral Interface (SPI)
  - 40.18.7 Synchronous Serial Controller (SSC)
  - 40.18.8 Two-wire Interface (TWI)
  - 40.18.9 Universal Synchronous Asynchronous Receiver Transmitter (USART)
  - 40.18.10 Voltage Regulator
    - 40.18.10.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.18.10.2 Voltage Regulator: Load Versus Temperature
- 40.19 SAM7S64 Errata - Revision C Parts
  - 40.19.1 Parallel Input/Output Controller (PIO)
    - 40.19.1.1 PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
    - 40.19.1.2 PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
  - 40.19.2 Pulse Width Modulation Controller (PWM)
  - 40.19.3 Real Time Timer (RTT)
    - 40.19.3.1 RTT: Possible Event Loss when Reading RTT_SR
- 40.20 SAM7S321 Errata - Revision A Parts
  - 40.20.1 Analog-to-Digital Converter (ADC)
  - 40.20.2 Parallel Input/Output Controller (PIO)
    - 40.20.2.1 PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
    - 40.20.2.2 PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
  - 40.20.3 Pulse Width Modulation Controller (PWM)
  - 40.20.4 Real Time Timer (RTT)
    - 40.20.4.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.20.5 Serial Peripheral Interface (SPI)
  - 40.20.6 Synchronous Serial Controller (SSC)
  - 40.20.7 Two-wire Interface (TWI)
  - 40.20.8 Universal Synchronous Asynchronous Receiver Transmitter (USART)
- 40.21 SAM7S32 Errata - Manufacturing Number 58814G
  - 40.21.1 Analog-to-Digital Converter (ADC)
  - 40.21.2 JTAG
    - 40.21.2.1 JTAG: Recommendation for TDI Pin
  - 40.21.3 Master Clock (MCK)
    - 40.21.3.1 MCK: Limited Master Clock Frequency Ranges
  - 40.21.4 Non Volatile Memory Bits (NVM Bits)
    - 40.21.4.1 NVM Bits: Write/Erase Cycles Number
  - 40.21.5 Parallel Input/Output Controller (PIO)
  - 40.21.6 Pulse Width Modulation Controller (PWM)
  - 40.21.7 Serial Peripheral Interface (SPI)
  - 40.21.8 Synchronous Serial Controller (SSC)
  - 40.21.9 Two-wire Interface (TWI)
  - 40.21.10 Universal Synchronous Asynchronous Receiver Transmitter (USART)
  - 40.21.11 Voltage Regulator
    - 40.21.11.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.21.11.2 Voltage Regulator: Load Versus Temperature
- 40.22 SAM7S32 Errata - Revision A Parts
  - 40.22.1 Analog-to-Digital Converter (ADC)
  - 40.22.2 Non Volatile Memory Bits (NVM Bits)
    - 40.22.2.1 NVM Bits: Write/Erase Cycles Number
  - 40.22.3 Parallel Input/Output Controller (PIO)
  - 40.22.4 Pulse Width Modulation Controller (PWM)
  - 40.22.5 Real Time Timer (RTT)
    - 40.22.5.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.22.6 Serial Peripheral Interface (SPI)
  - 40.22.7 Synchronous Serial Controller (SSC)
  - 40.22.8 Two-wire Interface (TWI)
  - 40.22.9 Universal Synchronous Asynchronous Receiver Transmitter (USART)
  - 40.22.10 Voltage Regulator
    - 40.22.10.1 Voltage Regulator: Current Consumption in Deep Mode
    - 40.22.10.2 Voltage Regulator: Load Versus Temperature
- 40.23 SAM7S32 Errata - Revision B Parts
  - 40.23.1 Analog-to-Digital Converter (ADC)
  - 40.23.2 Parallel Input/Output Controller (PIO)
    - 40.23.2.1 PIO: Electrical Characteristics on NRST and PA0-PA16 and PA21-31
    - 40.23.2.2 PIO: Drive Low NRST, PA0-PA16 and PA21-PA31
  - 40.23.3 Pulse Width Modulation Controller (PWM)
  - 40.23.4 Real Time Timer (RTT)
    - 40.23.4.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.23.5 Serial Peripheral Interface (SPI)
  - 40.23.6 Synchronous Serial Controller (SSC)
  - 40.23.7 Two-wire Interface (TWI)
  - 40.23.8 Universal Synchronous Asynchronous Receiver Transmitter (USART)
- 40.24 SAM7S161 Errata - Revision A Parts
  - 40.24.1 Analog-to-Digital Converter (ADC)
  - 40.24.2 Pulse Width Modulation Controller (PWM)
  - 40.24.3 Real Time Timer (RTT)
    - 40.24.3.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.24.4 Serial Peripheral Interface (SPI)
    - 40.24.4.1 SPI: Bad Serial Clock Generation on 2nd Chip Select
  - 40.24.5 Synchronous Serial Controller (SSC)
  - 40.24.6 Universal Synchronous Asynchronous Receiver Transmitter (USART)
    - 40.24.6.1 USART: DCD is active High instead of Low
- 40.25 SAM7S16 Errata - Revision A Parts
  - 40.25.1 Analog-to-Digital Converter (ADC)
  - 40.25.2 Pulse Width Modulation Controller (PWM)
  - 40.25.3 Real Time Timer (RTT)
    - 40.25.3.1 RTT: Possible Event Loss when Reading RTT_SR
  - 40.25.4 Serial Peripheral Interface (SPI)
    - 40.25.4.1 SPI: Bad Serial Clock Generation on 2nd Chip Select
  - 40.25.5 Synchronous Serial Controller (SSC)
  - 40.25.6 Universal Synchronous Asynchronous Receiver Transmitter (USART)
    - 40.25.6.1 USART: DCD is active High instead of Low
Revision History
Table of Contents

372

SAM7S Series [DATASHEET]

6175M–ATARM–26-Oct-12

31.6.3.4 Receiver Operations

When a character reception is completed, it is transferred to the Receive Holding Register (US_RHR) and the

RXRDY bit in the Status Register (US_CSR) rises. If a character is completed while the RXRDY is set, the OVRE

(Overrun Error) bit is set. The last character is transferred into US_RHR and overwrites the previous one. The

OVRE bit is cleared by writing the Control Register (US_CR) with the RSTSTA (Reset Status) bit at 1.

Figure 31-13. Receiver Status

D0 D1 D2 D3 D4 D5 D6 D7

RXD

Start

Bit

Parity

Bit

Stop

Bit

Baud Rate

Clock

Write

US_CR

RXRDY

OVRE

D0 D1 D2 D3 D4 D5 D6 D7

Start

Bit

Parity

Bit

Stop

Bit

RSTSTA = 1

Read

US_RHR