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參數(shù)資料
| 型號(hào)： | MC68HSC05J1A |
| 廠商： | 飛思卡爾半導(dǎo)體(中國(guó))有限公司 |
| 英文描述： | Microcontrollers |
| 中文描述： | 微控制器 |
| 文件頁(yè)數(shù)： | 36/128頁(yè) |
| 文件大?。?/td> | 1620K |
| 代理商： | MC68HSC05J1A |
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Technical Data
MC68HC05J1A — Rev. 3.0
36
Central Processor Unit (CPU)
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Central Processor Unit (CPU)
3.3.3 Stack Pointer
The stack pointer (SP) shown in
Figure 3-4
is a 16-bit register that
contains the address of the next free location on the stack. During a reset
or after the reset stack pointer (RSP) instruction, the stack pointer
initializes to $00FF. The address in the stack pointer decrements as data
is pushed onto the stack and increments as data is pulled from the stack.
The 10 most significant bits of the stack pointer are fixed permanently at
0000000011, so the stack pointer produces addresses from $00C0 to
$00FF. If subroutines and interrupts use more than 64 stack locations,
the stack pointer wraps around to address $00FF and begins writing
over the previously stored data. A subroutine uses two stack locations.
An interrupt uses five locations.
Figure 3-4. Stack Pointer (SP)
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Bit
0
Read:
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
Write:
Reset:
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
= Unimplemented
F
Freescale Semiconductor, Inc.
n
.
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