ATTINY817-MFR. datasheet(40/492 Pages) MICROCHIP

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Figure 8-4. AVR CPU General Purpose Working Registers

...

R13

R14

R15

R16

R17

R26

R27

R28

R29

R30

R31

Addr.

0x00

0x01

0x02

0x0D

0x0E

0x0F

0x10

0x11

0x1A

0x1B

0x1C

0x1D

0x1E

0x1F

X-register Low Byte

X-register High Byte

Y-register Low Byte

Y-register High Byte

Z-register Low Byte

Z-register High Byte

The register file is located in a separate address space and is therefore not accessible trough instructions

operation on data memory.

8.5.5.1

The X-, Y-, and Z- Registers

Registers R26...R31 have added functions besides their general-purpose usage.

These registers can form 16-bit address pointers for addressing data memory. These three address

registers are called the X-register, Y-register, and Z-register. Load and store instructions can use all X-, Y-

and Z-registers, while the LPM instructions can only use the Z-register. Indirect calls and jumps (ICALL

and IJMP) also use the Z-register.

Refer to the instruction set or Instruction Set Summary for more information about how the X-, Y- and Z-

registers are used.

Figure 8-5. The X-, Y- and Z-registers

Bit (individually)

X-register

Bit (X-register)

R27

R26

Bit (individually)

Y-register

Bit (Y-register)

R29

R28

Bit (individually)

Z-register

Bit (Z-register)

R31

R30

The lowest register address holds the least-significant byte (LSB), and the highest register address holds

the most-significant byte (MSB). In the different addressing modes, these address registers function as

fixed displacement, automatic increment, and automatic decrement.

ATTINY817-MFR. Datasheet(PDF) 40 Page - Microchip Technology

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