ATTINY1634(2014) Просмотр технического описания (PDF) - Atmel Corporation

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ATTINY1634
(Rev.:2014)

8-bit AVR Microcontroller with 16KB In-system Programmable Flash

Atmel Corporation 

Figure 5-2 below shows the structure of the 32 general purpose working registers in the CPU.

Figure 5-2. General Purpose Working Registers

7

0 Addr.

Special Function

R0

0x00

R1

0x01

R2

0x02

R3

0x03

…

...

R12

0x0C

R13

0x0D

R14

0x0E

R15

0x0F

R16

0x10

R17

0x11

…

...

R26

0x1A

X register low byte

R27

0x1B

X register high byte

R28

0x1C

Y register low byte

R29

0x1D

Y register high byte

R30

0x1E

Z register low byte

R31

0x1F

Z register high byte

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 5-2, each register is also assigned a data memory address, mapping them directly to the first 32

locations of the user data space. Although not physically implemented as SRAM locations, this memory organization

provides excellent flexibility when accessing registers because the X, Y, and Z pointer registers can be set to index any

register in the file.

5.4.1

The X, Y, and Z registers

The registers R26..R31 have functions going beyond 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 5-3 below.

Figure 5-3. The X, Y, and Z registers

15

0

X register

7

XH

07

XL

0

R27

R26

15

0

Y register

7

YH

07

YL

0

R29

R28

15

0

Z register

7

ZH

07

ZL

0

R31

R30

10 ATtiny1634 [PRELIMINARY DATASHEET]

9296C–AVR–07/14

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