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參數(shù)資料
| 型號： | MC80C52CXXX-16 |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| 文件頁數(shù)： | 2/46頁 |
| 文件大?。?/td> | 4720K |
| 代理商： | MC80C52CXXX-16 |
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10
ATtiny20 [DATASHEET]
8235E–AVR–03/2013
Figure 4-2.
AVR
CPU General Purpose Working Registers
Note:
A typical implementation of the AVR register file includes 32 general prupose registers but ATtiny20 implements only
16 registers. For reasons of compatibility the registers are numbered R16:R31 and not R0:R15.
Most of the instructions operating on the Register File have direct access to all registers, and most of them are single
cycle instructions.
4.4.1
The X-register, Y-register, and Z-register
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 4-3.
Figure 4-3.
The X-, Y-, and Z-registers
In different addressing modes these address registers function as automatic increment and automatic decrement (see
document “AVR Instruction Set” and section “Instruction Set Summary” on page 205 for details).
4.5
Stack Pointer
The stack is mainly used for storing temporary data, local variables and return addresses after interrupts and subroutine
calls. The Stack Pointer registers (SPH and SPL) always point to the top of the stack. Note that the stack grows from
higher memory locations to lower memory locations. This means that the PUSH instructions decreases and the POP
instruction increases the stack pointer value.
70
R16
R16
R17
R17
General
R18
R18
Purpose
…
...
Working
R26
R26
X-register Low Byte
Registers
R27
R27
X-register High Byte
R28
R28
Y-register Low Byte
R29
R29
Y-register High Byte
R30
R30
Z-register Low Byte
R31
R31
Z-register High Byte
15
XH
XL
0
X-register
70
7
0
R27
R26
15
YH
YL
0
Y-register
70
7
0
R29
R28
15
ZH
ZL
0
Z-register
70
7
0
R31
R30
相關PDF資料 |
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|---|---|
| MR80C52EXXX-25/883 | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44 |
| MQ83C154XXX-12/883R | 8-BIT, MROM, 12 MHz, MICROCONTROLLER, CQFP44 |
| MC80C52CXXX-16P883 | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CDIP40 |
| MC80C32-12SBD | 8-BIT, 12 MHz, MICROCONTROLLER, CDIP40 |
| MR83C154DCXXX-25P883 | 8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQCC44 |
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