ATMEGA323 查看數據表（PDF） - Atmel Corporation

零件编号

产品描述 (功能)

生产厂家

ATMEGA323

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

Atmel Corporation 

ATmega323(L)

The General Purpose

Register File

Figure 7 shows the structure of the 32 general purpose working registers in the CPU.

Figure 7. AVR CPU General Purpose Working Registers

General

Purpose

Working

Registers

7

0

R0

R1

R2

…

R13

R14

R15

R16

R17

…

R26

R27

R28

R29

R30

R31

Addr.

$00

$01

$02

$0D

$0E

$0F

$10

$11

$1A

$1B

$1C

$1D

$1E

$1F

X-register Low Byte

X-register High Byte

Y-register Low Byte

Y-register High Byte

Z-register Low Byte

Z-register High Byte

Most register operating instructions in the instruction set have direct access to all regis-

ters, and most of them are single cycle instructions.

As shown in Figure 7, each register is also assigned a Data memory address, mapping

them directly into the first 32 locations of the user Data Space. Although not being phys-

ically implemented as SRAM locations, this memory organization provides great

flexibility in access of the registers, as the X-, Y-, and Z-registers can be set to index any

register in the file.

The X-register, Y-register, and The registers R26..R31 have some added functions to their general purpose usage.

Z-register

These registers are address pointers for indirect addressing of the Data Space. The

three indirect address registers X, Y, and Z are defined as:

Figure 8. The X-, Y-, and Z-registers

X - register

15

XH

70

R27 ($1B)

XL

0

07

0

R26 ($1A)

Y - register

15

YH

70

R29 ($1D)

YL

0

07

0

R28 ($1C)

Z - register

15

ZH

70

R31 ($1F)

ZL

0

07

0

R30 ($1E)

In the different addressing modes these address registers have functions as fixed dis-

placement, automatic increment and decrement (see the descriptions for the different

instructions).

11

1457G–AVR–09/03

Share Link: