atmega161-4pi ATMEL Corporation, atmega161-4pi Datasheet - Page 4

• Manufacturer Part Number: atmega161-4pi
• Description: 8-bit Microcontroller With 16k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

Block Diagram
4
ATmega161(L)
Figure 1. The ATmega161 Block Diagram
VCC
GND
DATA REGISTER
PROGRAMMING
INSTRUCTION
INSTRUCTION
PROGRAM
PROGRAM
REGISTER
COUNTER
CONTROL
PORTA
DECODER
FLASH
LINES
LOGIC
DATA REGISTER
PORTA DRIVERS
PORTB
PA0-PA7
PORTB DRIVERS
PB0 - PB7
REG. PORTA
DATA DIR.
REGISTERS
REG. PORTB
REGISTER
PURPOSE
GENERAL
DATA DIR.
POINTER
STATUS
STACK
SRAM
ALU
SPI
X
Y
Z
8-BIT DATA BUS
DATA REGISTER
PORTD
DATA REGISTER
PORTD DRIVERS
PORTC
MCU CONTROL
OSCILLATOR
WATCHDOG
INTERRUPT
COUNTERS
REGISTER
INTERNAL
PD0 - PD7
EEPROM
TIMER/
PORTC DRIVERS
TIMER
UARTS
UNIT
PC0-PC7
REG. PORTD
DATA DIR.
REG. PORTC
DATA DIR.
DATA REG.
OSCILLATOR
TIMING AND
PORTE
CONTROL
PORTE DRIVERS
PE0 - PE2
REG. PORTE
DATA DIR
1228D–AVR–02/07
XTAL1
XTAL2
RESET