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

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ATTINY22L

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

Atmel Corporation 

SRAM Data Memory

The following figure shows how the ATtiny22/L Data Memory is organized:

Figure 7. SRAM Organization

Register File

R0

R1

R2

…

Data Address Space

$00

$01

$02

…

R29

$1D

R30

$1E

R31

$1F

I/O Registers

$00

$20

$01

$21

$02

$22

…

…

$3D

$5D

$3E

$5E

$3F

$5F

Internal SRAM

$60

$61

$62

…

$DD

$DE

$DF

The 224 Data Memory locations address the Register file, I/O Memory and the data SRAM. The first 96 locations address

the Register File + I/O Memory, and the next 128 locations address the data SRAM.

The five different addressing modes for the data memory cover: Direct, Indirect with Displacement, Indirect, Indirect with

Pre-Decrement and Indirect with Post-Increment. In the register file, registers R26 to R31 feature the indirect addressing

pointer registers.

The Direct addressing reaches the entire data address space.

The Indirect with Displacement mode features 63 address locations reach from the base address given by the Y and Z

register.

When using register indirect addressing modes with automatic pre-decrement and post-increment, the address registers X,

Y and Z are used and decremented and incremented.

The 32 general purpose working registers, 64 I/O registers and the 128 bytes of data SRAM in the ATtiny22/L are all

directly accessible through all these addressing modes.

8

ATtiny22/22L

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