atmega323l ATMEL Corporation, atmega323l Datasheet - Page 3

• Manufacturer Part Number: atmega323l
• Description: Atmega323 8-bit Avr Microcontroller With 32k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

Overview
Block Diagram
1457G–AVR–09/03
The ATmega323 is a low-power CMOS 8-bit microcontroller based on the AVR
enhanced RISC architecture. By executing powerful instructions in a single clock cycle,
the ATmega323 achieves throughputs approaching 1 MIPS per MHz allowing the sys-
tem designer to optimize power consumption versus processing speed.
Figure 1. Block Diagram
AGND
AVCC
AREF
GND
VCC
PROGRAMMING
INSTRUCTION
REFERENCE
INSTRUCTION
INTERNAL
PROGRAM
PROGRAM
REGISTER
COUNTER
CONTROL
DECODER
FLASH
LOGIC
LINES
DATA REGISTER
DATA REGISTER
ANALOG MUX
PORTB
PORTA
PORTA DRIVERS
PORTB DRIVERS
PA0 - PA7
PB0 - PB7
REGISTERS
REGISTER
PURPOSE
GENERAL
POINTER
STATUS
STACK
SRAM
ALU
SPI
X
Y
Z
REG. PORTB
REG. PORTA
DATA DIR.
DATA DIR.
ADC
8-BIT DATA BUS
DATA REGISTER
DATA REGISTER
MCU CONTROL
2-WIRE SERIAL
OSCILLATOR
CALIBRATED
OSCILLATOR
WATCHDOG
COUNTERS
INTERRUPT
INTERFACE
REGISTER
INTERNAL
INTERNAL
EEPROM
PORTC
TIMER/
PORTD
TIMER
USART
UNIT
PORTC DRIVERS
PORTD DRIVERS
PC0 - PC7
PD0 - PD7
ATmega323(L)
REG. PORTC
REG. PORTD
DATA DIR.
DATA DIR.
OSCILLATOR
OSCILLATOR
TIMING AND
INTERFACE
CONTROL
JTAG
XTAL1
XTAL2
RESET
3