參數(shù)資料
型號: MC68HLC705KJ1CDWR2
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDSO16
封裝: SOIC-16
文件頁數(shù): 85/144頁
文件大小: 1377K
代理商: MC68HLC705KJ1CDWR2
Central Processor Unit (CPU)
CPU Registers
MC68HC705KJ1 — Rev. 2.0
Technical Data
MOTOROLA
Central Processor Unit (CPU)
45
4.6.3 Stack Pointer
The stack pointer is a 16-bit register that contains the address of the next
location on the stack. During a reset or after the reset stack pointer
instruction (RSP), the stack pointer is preset to $00FF. The address in
the stack pointer decrements after a byte is stacked and increments
before a byte is unstacked.
The 10 most significant bits of the stack pointer are permanently fixed 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.
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Bit
0
Read:
0
1
Write:
Reset:
0
1
= Unimplemented
Figure 4-4. Stack Pointer (SP)
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