atmega103 ATMEL Corporation, atmega103 Datasheet - Page 4

• Manufacturer Part Number: atmega103
• Description: Atmega103 8-bit With 128k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

Block Diagram
4
ATmega103(L)
Figure 1. The ATmega103(L) Block Diagram
AGND
AVCC
AREF
GND
VCC
DATA REGISTER
ANALOG MUX
PORTE
PORTE DRIVER/BUFFERS
PORTF BUFFERS
INSTRUCTION
INSTRUCTION
PROGRAM
COUNTER
PROGRAM
REGISTER
PF0 - PF7
CONTROL
DECODER
PE0 - PE7
FLASH
LINES
REG. PORTE
DATA DIR.
ADC
REGISTERS
REGISTER
PURPOSE
GENERAL
POINTER
STATUS
STACK
SRAM
DATA REGISTER
ALU
SPI
DATA REGISTER
X
Y
Z
PORTB
PORTA
PORTB DRIVER/BUFFERS
PORTA DRIVER/BUFFERS
PA0 - PA7
PB0 - PB7
REG. PORTA
DATA DIR.
REG. PORTB
DATA DIR.
PROGRAMMING
MCU CONTROL
OSCILLATOR
WATCHDOG
INTERRUPT
COUNTERS
INTERNAL
REGISTER
EEPROM
TIMER/
TIMER
LOGIC
UART
UNIT
8-BIT DATA BUS
DATA REGISTER
PORTD
PORTC DRIVERS
DATA REGISTER
PORTD DRIVER/BUFFERS
PC0 - PC7
OSCILLATOR
OSCILLATOR
TIMING AND
PORTC
CONTROL
PD0 - PD7
REG. PORTD
DATA DIR.
0945I–AVR–02/07
RESET
XTAL1
TOSC2
TOSC1
XTAL1
ALE
WR
RD
PEN
VCC
GND