Rainbow Electronics ATmega161L - Manual (Page 4)

4
ATmega161(L)
1228C–AVR–08/02
Block Diagram Figure 1. The ATmega161 Block Diagram
PROGRAMMING
LOGIC
SPI UARTS
PB0 - PB7
VCC
GND
+ -
ANALOG
COMP
ARA
TOR
8-BIT DATA BUS
DATA DIR.
REG. PORTA
DATA REGISTER
PORTA
PORTA DRIVERS
PA0-PA7
DATA DIR.
REG. PORTC
DATA REGISTER
PORTC
PORTC DRIVERS
PC0-PC7
PORTD DRIVERS
PD0 - PD7
DATA DIR.
REG. PORTD
DATA REGISTER
PORTB
PORTB DRIVERS PORTE DRIVERS
PE0 - PE2
DATA REG.
PORTE
DATA DIR
REG. PORTE
PROGRAM
COUNTER
INTERNAL
OSCILLATOR
WATCHDOG
TIMER
STACK
POINTER
PROGRAM
FLASH
MCU CONTROL
REGISTER
SRAM
GENERAL
PURPOSE
REGISTERS
INSTRUCTION
REGISTER
TIMER/
COUNTERS
INSTRUCTION
DECODER
TIMING AND
CONTROL
OSCILLATOR
INTERRUPT
UNIT
EEPROM
STATUS
REGISTER
Z
Y
X
ALU
RESET
XTAL2
XTAL1
CONTROL
LINES
DATA DIR.
REG. PORTB
DATA REGISTER
PORTD