Rainbow Electronics ATmega103L - Manual (Page 3)

ATmega603/103
3
Block Diagram
Figure 1. The ATmega603/103 Block Diagram
PROGRAM
COUNTER
INTERNAL
OSCILLATOR
WATCHDOG
TIMER
STACK
POINTER
PROGRAM
FLASH
MCU CONTROL
REGISTER
SRAM
GENERAL
PURPOSE
REGISTERS
INSTRUCTION
REGISTER
TIMER/
COUNTERS
INSTRUCTION
DECODER
DATA DIR.
REG. PORTB
DATA DIR.
REG. PORTE
DATA DIR.
REG. PORTA
DATA DIR.
REG. PORTD
DATA REGISTER
PORTB
DATA REGISTER
PORTE
DATA REGISTER
PORTA
DATA REGISTER
PORTC
DATA REGISTER
PORTD
PROGRAMMING
LOGIC
TIMING AND
CONTROL
OSCILLATOR
OSCILLATOR
INTERRUPT
UNIT
EEPROM
SPI UART
STATUS
REGISTER
Z
Y
X
ALU
PORTB DRIVER/BUFFERS PORTE DRIVER/BUFFERS
PORTA DRIVER/BUFFERS PORTF BUFFERS
ANALOG MUX ADC
PORTD DRIVER/BUFFERS
PORTC DRIVERS
PB0 PB7 PE0 PE7
RESET
VCC
VCC
AGND
GND
GND
AREF
TOSC2
TOSC1
XTAL1
XTAL1
CONTROL
LINES
+ -
ANALOG
COMP
ARA
T
O
R
PD0 PD7
PEN
ALE
WR
RD
8-BIT DATA BUS
AVCC