Datasheet
Table Of Contents
- Features
- Pin Configuration
- Description
- Architectural Overview
- General-purpose Register File
- ALU – Arithmetic Logic Unit
- Flash Program Memory
- Program and Data Addressing Modes
- Subroutine and Interrupt Hardware Stack
- EEPROM Data Memory
- Memory Access and Instruction Execution Timing
- I/O Memory
- Reset and Interrupt Handling
- ATtiny12 Internal Voltage Reference
- Interrupt Handling
- Sleep Modes for the ATtiny11
- Sleep Modes for the ATtiny12
- ATtiny12 Calibrated Internal RC Oscillator
- Timer/Counter0
- Watchdog Timer
- ATtiny12 EEPROM Read/Write Access
- Analog Comparator
- I/O Port B
- Memory Programming
- Program (and Data) Memory Lock Bits
- Fuse Bits in ATtiny11
- Fuse Bits in ATtiny12
- Signature Bytes
- Calibration Byte in ATtiny12
- Programming the Flash and EEPROM
- High-voltage Serial Programming
- High-voltage Serial Programming Algorithm
- High-voltage Serial Programming Characteristics
- Low-voltage Serial Downloading (ATtiny12 only)
- Low-voltage Serial Programming Characteristics
- Electrical Characteristics
- Register Summary ATtiny11
- Register Summary ATtiny12
- Instruction Set Summary
- Ordering Information
- Packaging Information
- Data Sheet Change Log for ATtiny11/12
- Table of Contents
4
ATtiny11/12
1006D–AVR–07/03
ATtiny12 Block Diagram Figure 2. The ATtiny12 Block Diagram
The ATtiny12 provides the following features: 1K bytes of Flash, 64 bytes EEPROM, up
to six general-purpose I/O lines, 32 general-purpose working registers, an 8-bit
timer/counter, internal and external interrupts, programmable Watchdog Timer with
internal oscillator, and two software-selectable power-saving modes. The Idle Mode
stops the CPU while allowing the timer/counters and interrupt system to continue func-
tioning. The Power-down Mode saves the register contents but freezes the oscillator,
disabling all other chip functions until the next interrupt or hardware reset. The wake-up
or interrupt on pin change features enable the ATtiny12 to be highly responsive to exter-
nal events, still featuring the lowest power consumption while in the power-down modes.
The device is manufactured using Atmel’s high-density nonvolatile memory technology.
By combining an RISC 8-bit CPU with Flash on a monolithic chip, the Atmel ATtiny12 is
a powerful microcontroller that provides a highly-flexible and cost-effective solution to
many embedded control applications.
PROGRAM
COUNTER
INTERNAL
OSCILLATOR
WATCHDOG
TIMER
STACK
POINTER
PROGRAM
FLASH
HARDWARE
STACK
MCU CONTROL
REGISTER
GENERAL-
PURPOSE
REGISTERS
INSTRUCTION
REGISTER
TIMER/
COUNTER
INSTRUCTION
DECODER
DATA DIR.
REG. PORTB
DATA REGISTER
PORTB
PROGRAMMING
LOGIC
OSCILLATORS
TIMING AND
CONTROL
INTERRUPT
UNIT
MCU STATUS
REGISTER
STATUS
REGISTER
ALU
PORTB DRIVERS
PB0-PB5
VCC
GND
CONTROL
LINES
+
-
ANALOG
COMP
ARATOR
Z
8-BIT DATA BUS
EEPROM
SPI
INTERNAL
OSCILLATOR
CALIBRATED