ATmega16 datasheet(9/315 Pages) ATMEL

9 / 315 page

ATmega16(L)

2466E–AVR–10/02

Figure 4. AVR CPU General Purpose Working Registers

Most of the instructions operating on the Register File have direct access to all registers,

and most of them are single cycle instructions.

As shown in Figure 4, 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-pointer Registers can be set to

index any register in the file.

The X-register, Y-register and

Z-register

The registers R26..R31 have some added functions to their general purpose usage.

These registers are 16-bit address pointers for indirect addressing of the Data Space.

The three indirect address registers X, Y, and Z are defined as described in Figure 5.

Figure 5. The X-, Y-, and Z-registers

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

placement, automatic increment, and automatic decrement (see the Instruction Set

Reference for details).

Addr.

$00

$01

$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

X - register

R27 ($1B)

R26 ($1A)

Y - register

R29 ($1D)

R28 ($1C)

Z - register

R31 ($1F)

R30 ($1E)

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