Datasheet

ManualsBrandsMicrochip ManualsAVR MicrocontrollersAVR Microcontroller Flash 128KB VQFN

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Table Of Contents

Features
1. Ordering Information
2. Pinout/Block Diagram
3. Overview
- 3.1 Block Diagram
4. Resources
- 4.1 Recommended reading
5. Capacitive touch sensing
6. AVR CPU
- 6.1 Features
- 6.2 Overview
- 6.3 Architectural Overview
- 6.4 ALU - Arithmetic Logic Unit
  - 6.4.1 Hardware Multiplier
- 6.5 Program Flow
- 6.6 Status Register
- 6.7 Stack and Stack Pointer
- 6.8 Register File
7. Memories
- 7.1 Features
- 7.2 Overview
- 7.3 Flash Program Memory
- 7.4 Fuses and Lock bits
- 7.5 Data Memory
- 7.6 EEPROM
- 7.7 I/O Memory
  - 7.7.1 General Purpose I/O Registers
- 7.8 Data Memory and Bus Arbitration
- 7.9 Memory Timing
- 7.10 Device ID and Revision
- 7.11 I/O Memory Protection
- 7.12 Flash and EEPROM Page Size
8. DMAC – Direct Memory Access Controller
- 8.1 Features
- 8.2 Overview
9. Event System
- 9.1 Features
- 9.2 Overview
10. System Clock and Clock options
- 10.1 Features
- 10.2 Overview
- 10.3 Clock Sources
11. Power Management and Sleep Modes
- 11.1 Features
- 11.2 Overview
- 11.3 Sleep Modes
12. System Control and Reset
- 12.1 Features
- 12.2 Overview
- 12.3 Reset Sequence
- 12.4 Reset Sources
13. WDT – Watchdog Timer
- 13.1 Features
- 13.2 Overview
14. Interrupts and Programmable Multilevel Interrupt Controller
- 14.1 Features
- 14.2 Overview
- 14.3 Interrupt vectors
15. I/O Ports
- 15.1 Features
- 15.2 Overview
- 15.3 Output Driver
- 15.4 Input sensing
- 15.5 Alternate Port Functions
16. TC0/1 – 16-bit Timer/Counter Type 0 and 1
- 16.1 Features
- 16.2 Overview
17. TC2 - Timer/Counter Type 2
- 17.1 Features
- 17.2 Overview
18. AWeX – Advanced Waveform Extension
- 18.1 Features
- 18.2 Overview
19. Hi-Res – High Resolution Extension
- 19.1 Features
- 19.2 Overview
20. RTC – 16-bit Real-Time Counter
- 20.1 Features
- 20.2 Overview
21. USB – Universal Serial Bus Interface
- 21.1 Features
- 21.2 Overview
22. TWI – Two-Wire Interface
- 22.1 Features
- 22.2 Overview
23. SPI – Serial Peripheral Interface
- 23.1 Features
- 23.2 Overview
24. USART
- 24.1 Features
- 24.2 Overview
25. IRCOM – IR Communication Module
- 25.1 Features
- 25.2 Overview
26. AES and DES Crypto Engine
- 26.1 Features
- 26.2 Overview
27. CRC – Cyclic Redundancy Check Generator
- 27.1 Features
- 27.2 Overview
28. ADC – 12-bit Analog to Digital Converter
- 28.1 Features
- 28.2 Overview
29. DAC – 12-bit Digital to Analog Converter
- 29.1 Features
- 29.2 Overview
30. AC – Analog Comparator
- 30.1 Features
- 30.2 Overview
31. Programming and Debugging
- 31.1 Features
- 31.2 Overview
32. Pinout and Pin Functions
- 32.1 Alternate Pin Function Description
- 32.2 Alternate Pin Functions
33. Peripheral Module Address Map
34. Instruction Set Summary
35. Packaging information
- 35.1 44A
- 35.2 PW
- 35.3 44M1
- 35.4 49C2
36. Electrical Characteristics
- 36.1 ATxmega16A4U
- 36.2 ATxmega32A4U
- 36.3 ATxmega64A4U
- 36.4 ATxmega128A4U
37. Typical Characteristics
- 37.1 ATxmega16A4U
- 37.2 ATxmega32A4U
- 37.3 ATxmega64A4U
- 37.4 ATxmega128A4U
38. Errata
- 38.1 ATxmega16A4U
  - 38.1.1 Rev. E
  - 38.1.2 Rev. A - D
- 38.2 ATxmega32A4U
  - 38.2.1 Rev. E
  - 38.2.2 Rev. A - D
- 38.3 ATxmega64A4U
- 38.4 ATxmega128A4U
  - 38.4.1 rev. A
39. Datasheet Revision History
- 39.1 8387H –09/2014
- 39.2 8387G – 03/2014
- 39.3 8387F – 01/2014
- 39.4 8387E – 11/2013
- 39.5 8387D – 02/2013
- 39.6 8387C – 03/2012
- 39.7 8387B – 12/2011
- 39.8 8387A – 07/2011
Table of Contents

331

XMEGA A4U [DATASHEET]

Atmel-8387H-AVR-ATxmega16A4U-34A4U-64A4U-128A4U-Datasheet_09/2014

38.4 ATxmega128A4U

38.4.1 rev. A

z ADC may have missing codes in SE unsigned mode at low temp and low Vcc

1. ADC may have missing codes in SE unsigned mode at low temp and low Vcc

The ADC may have missing codes i single ended (SE) unsigned mode below 0C when Vcc is below 1.8V.

Problem fix/Workaround

Use the ADC in SE signed mode.