ATMEGA323-8AC Atmel, ATMEGA323-8AC Datasheet - Page 9
![IC AVR MCU 32K 8MHZ COM 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA323-8AC
Manufacturer Part Number
ATMEGA323-8AC
Description
IC AVR MCU 32K 8MHZ COM 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA323L-4PC.pdf
(247 pages)
Specifications of ATMEGA323-8AC
Core Processor
AVR
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA3238AC
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1457G–AVR–09/03
Figure 5. The ATmega323 AVR Enhanced RISC Architecture
The AVR uses a Harvard architecture concept – with separate memories and buses for
Program and Data. The Program memory is executed with a single level pipelining.
While one instruction is being executed, the next instruction is pre-fetched from the Pro-
gram memory. This concept enables instructions to be executed in every clock cycle.
The Program memory is In-System Reprogrammable Flash memory.
With the jump and call instructions, the whole 16K address space is directly accessed.
Most AVR instructions have a single 16-bit word format. Every Program memory
address contains a 16- or 32-bit instruction.
Program Flash memory space is divided in two sections, the Boot Program section (512
to 4K bytes, see page 177) and the Application Program section. Both sections have
dedicated Lock bits for write and read/write protection. The SPM instruction that writes
into the Application Flash memory section is allowed only in the Boot Program section.
During interrupts and subroutine calls, the return address Program Counter (PC) is
stored on the Stack. The Stack is effectively allocated in the general data SRAM, and
consequently the Stack size is only limited by the total SRAM size and the usage of the
SRAM. All user programs must initialize the SP in the Reset Routine (before subroutines
or interrupts are executed). The 12-bit Stack Pointer SP is read/write accessible in the
I/O space.
Control Lines
Instruction
Instruction
16K X 16
Program
Memory
Register
Decoder
Program
Counter
and Control
EEPROM
Registrers
I/O Lines
Purpose
General
1K x 8
SRAM
2K x 8
Data Bus 8-bit
Status
32 x 8
Data
ALU
32
ATmega323(L)
MUX and Gain
A/D Converter
Timer/Counter
Timer/Counter
Timer/Counter
Comparator
with PWM
with PWM
Watchdog
with PWM
Interrupt
TWI Bus
Serial
USART
Analog
16-bit
Timer
Serial
Unit
8-bit
Unit
8-bit
SPI
9
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