ATMEGA323L-4AI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA323L-4AI

8-bit Microcontroller with 32K Bytes of In-System Programmable Flash

Atmel Corporation 

Figure 22. Single Cycle ALU Operation

T1

T2

T3

T4

System Clock Ø

Total Execution Time

Register Operands Fetch

ALU Operation Execute

Result Write Back

The internal data SRAM access is performed in two System Clock cycles as described

in Figure 23.

Figure 23. On-chip Data SRAM Access Cycles

T1

T2

T3

T4

System Clock Ø

Address

Data

WR

Data

RD

Prev. Address

Address

I/O Memory

The I/O space definition of the ATmega323 is shown in Table 2.

Table 2. ATmega323 I/O Space

I/O Address (SRAM

Address)

Name

$3F ($5F)

SREG

$3E ($5E)

SPH

$3D ($5D)

SPL

$3C ($3C)

OCR0

$3B ($5B)

GICR

$3A ($5A)

GIFR

$39 ($59)

TIMSK

$38 ($58)

TIFR

$37 ($57)

SPMCR

$36 ($56)

TWCR

$35 ($55)

MCUCR

$34 ($54)

MCUCSR

Function

Status Register

Stack Pointer High

Stack Pointer Low

Timer/Counter0 Output Compare Register

General Interrupt Control Register

General Interrupt Flag Register

Timer/Counter Interrupt Mask Register

Timer/Counter Interrupt Flag Register

SPM Control Register

Two-wire Serial Interface Control Register

MCU general Control Register

MCU general Control and Status Register

18 ATmega323(L)

1457G–AVR–09/03

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