4

ATtiny11/12

1006FS–AVR–06/07

ATtiny12 Block Diagram

Figure 2 on page 4. 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 regis-

ters, 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 con-

tinue functioning. 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 external 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.

Figure 2. The ATtiny12 Block Diagram

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

Z

8-BIT DATA BUS

EEPROM

SPI

INTERNAL

OSCILLATOR

CALIBRATED