ATMEGA128-8AI ATMEL Corporation, ATMEGA128-8AI Datasheet - Page 3

• Manufacturer Part Number: ATMEGA128-8AI
• Description: 8-bit Microcontroller with 128K Bytes In-System Programmable Flash
• Manufacturer: ATMEL Corporation

Block Diagram
Figure 2. Block Diagram
2467AS–08/01
AREF
AGND
AVCC
PEN
GND
VCC
ON-CHIP DEBUG
PROGRAMMING
BOUNDARY-
JTAG TAP
LOGIC
SCAN
DATA REGISTER
DATA REGISTER
PORTE
PORTF
USART0
PORTF DRIVERS
PORTE DRIVERS
PF0 - PF7
PE0 - PE7
INSTRUCTION
INSTRUCTION
PROGRAM
PROGRAM
REGISTER
COUNTER
CONTROL
DECODER
FLASH
LINES
ADC
REG. PORTE
REG. PORTF
DATA DIR.
DATA DIR.
DATA REGISTER
REGISTERS
REGISTER
GENERAL
PURPOSE
POINTER
STATUS
STACK
SRAM
PORTB
DATA REGISTER
ALU
X
Y
Z
PORTA
PORTB DRIVERS
PB0 - PB7
PORTA DRIVERS
PA0 - PA7
REG. PORTB
DATA DIR.
REG. PORTA
DATA DIR.
MCU CONTROL
OSCILLATOR
WATCHDOG
COUNTERS
INTERRUPT
REGISTER
INTERNAL
EEPROM
TIMER/
TIMER
UNIT
SPI
8-BIT DATA BUS
DATA REGISTER
PORTD
DATA REGISTER
PORTD DRIVERS
PD0 - PD7
PORTC
OSCILLATOR
OSCILLATOR
TIMING AND
CALIB. OSC
CONTROL
PORTC DRIVERS
USART1
REG. PORTD
PC0 - PC7
DATA DIR.
ATmega128(L)
REG. PORTC
DATA DIR.
2-WIRE SERIAL
INTERFACE
DATA REG.
PORTG
PORTG DRIVERS
PG0 - PG4
REG. PORTG
DATA DIR.
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