ATTINY22L(2000) データシートの表示（PDF） - Atmel Corporation

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ATTINY22L
(Rev.:2000)

8-bit Microcontroller with 2K Bytes of In-System Programmable Flash

Atmel Corporation 

General Purpose Register File

Figure 4 shows the structure of the 32 general purpose registers in the CPU.

Figure 4. AVR CPU General Purpose Working Registers

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0 Addr.

R0

$00

R1

$01

R2

$02

…

R13

$0D

General

R14

$0E

Purpose

R15

$0F

Working

R16

$10

Registers

R17

$11

…

R26

$1A X-register low byte

R27

$1B X-register high byte

R28

$1C Y-register low byte

R29

$1D Y-register high byte

R30

$1E Z-register low byte

R31

$1F Z-register high byte

All the register operating instructions in the instruction set have direct and single cycle access to all registers. The only

exception is the five constant arithmetic and logic instructions SBCI, SUBI, CPI, ANDI, ORI between a constant and a

register and the LDI instruction for load immediate constant data. These instructions apply to the second half of the regis-

ters in the register file - R16..R31. The general SBC, SUB, CP, AND, OR and all other operations between two registers or

on a single register apply to the entire register file.

As shown in Figure 4, each register is also assigned a data memory address, mapping them directly into the first 32 loca-

tions of the user Data Space. Although the register file is not physically 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.

6

ATtiny22L

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