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ATMEGA128 Datasheet
8-bit Atmel Microcontroller
ATMEL Corporation
ATMEL Corporation


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ATMEGA128 pdf
Block Diagram
Figure 2. Block Diagram
ATmega128
VCC
GND
PF0 - PF7
PORTF DRIVERS
PA0 - PA7
PORTA DRIVERS
PC0 - PC7
PORTC DRIVERS
DATA REGISTER
PORTF
DATA DIR.
REG. PORTF
DATA REGISTER
PORTA
DATA DIR.
REG. PORTA
DATA REGISTER
PORTC
8-BIT DATA BUS
DATA DIR.
REG. PORTC
AVCC
AGND
AREF
JTAG TAP
ON-CHIP DEBUG
BOUNDARY-
SCAN
PEN
PROGRAMMING
LOGIC
ADC
PROGRAM
COUNTER
PROGRAM
FLASH
INSTRUCTION
REGISTER
INSTRUCTION
DECODER
CONTROL
LINES
USART0
STACK
POINTER
SRAM
GENERAL
PURPOSE
REGISTERS
X
Y
Z
ALU
STATUS
REGISTER
INTERNAL
OSCILLATOR
WATCHDOG
TIMER
MCU CONTROL
REGISTER
TIMER/
COUNTERS
INTERRUPT
UNIT
EEPROM
CALIB. OSC
OSCILLATOR
OSCILLATOR
TIMING AND
CONTROL
SPI
USART1
TWO-WIRE SERIAL
INTERFACE
DATA REGISTER
PORTE
DATA DIR.
REG. PORTE
DATA REGISTER
PORTB
DATA DIR.
REG. PORTB
DATA REGISTER
PORTD
DATA DIR.
REG. PORTD
DATA REG. DATA DIR.
PORTG REG. PORTG
PORTE DRIVERS
PORTB DRIVERS
PORTD DRIVERS
PORTG DRIVERS
PE0 - PE7
PB0 - PB7
PD0 - PD7
PG0 - PG4
2467X–AVR–06/11
3

ATMEGA128 Datasheet PDF



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