4

ATmega164/324/644

2593AS–AVR–06/05

Disclaimer

Typical values contained in this datasheet are based on simulations and characteriza-

tion of other AVR microcontrollers manufactured on the same process technology. Min

and Max values will be available after the device is characterized.

Overview

The ATmega164/324/644 is a low-power CMOS 8-bit microcontroller based on the AVR

enhanced RISC architecture. By executing powerful instructions in a single clock cycle,

the ATmega164/324/644 achieves throughputs approaching 1 MIPS per MHz allowing

the system designer to optimize power consumption versus processing speed.

Block Diagram

Figure 3. Block Diagram

CPU

GND

VCC

RESET

Power

Supervision

POR / BOD &

RESET

Watchdog

Oscillator

Watchdog

Timer

Oscillator

Circuits /

Clock

Generation

XTAL1

XTAL2

PORT A (8)

PORT D (8)

PD7..0

PORT C (8)

PC7..0

TWI

SPI

EEPROM

JTAG

8bit T/C 0

8bit T/C 2

16bit T/C 1

SRAM

FLASH

USART 0

Internal

Bandgap reference

Analog

Comparator

A/D

Converter

NOTE:

The USART 1 is only

available for ATmega164/324

PA7..0

PORT B (8)

PB7..0

USART 1