ATMEGA1284 データシートの表示（PDF） - Atmel Corporation

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ATMEGA1284

8-bit AVR Microcontroller with 16/32/64/128K Bytes In-System Programmable Flash

Atmel Corporation 

164A/164PA/324A/324PA/644A/644PA/1284/1284P

2. Overview

The ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P is a low-power CMOS 8-bit

microcontroller based on the AVR enhanced RISC architecture. By executing powerful instruc-

tions in a single clock cycle, the ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P

achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize

power consumption versus processing speed.

2.1 Block Diagram

Figure 2-1. Block Diagram

VCC

PA7..0

PB7..0

RESET

GND

XTAL1

XTAL2

Power

Supervision

POR / BOD &

RESET

Watchdog

Timer

Watchdog

Oscillator

Oscillator

Circuits /

Clock

Generation

PORT A (8)

PORT B (8)

A/D

Converter

EEPROM

Internal

Bandgap reference

Analog

Comparator

SPI

CPU

JTAG/OCD

TWI

FLASH

SRAM

8bit T/C 0

16bit T/C 1

8bit T/C 2

USART 0

USART 1

PORT C (8)

PORT D (8)

TOSC2/PC7 TOSC1/PC6

PC5..0

PD7..0

The AVR core combines a rich instruction set with 32 general purpose working registers. All the

32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent

registers to be accessed in one single instruction executed in one clock cycle. The resulting

architecture is more code efficient while achieving throughputs up to ten times faster than

conventional CISC microcontrollers.

The ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P provide the following features:

5

8272AS–AVR–01/10

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