參數(shù)資料
型號: MC68HCL05K0DW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, MICROCONTROLLER, PDSO16
封裝: SOIC-16
文件頁數(shù): 87/154頁
文件大?。?/td> 1544K
代理商: MC68HCL05K0DW
Technical Data
MC68HC05K0 MC68HC05K1 — Rev. 2.0
38
Central Processor Unit (CPU)
MOTOROLA
Technical Data
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 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 11 most significant bits of the stack pointer are permanently fixed at
00000000111, so the stack pointer produces addresses from $00FF to
$00E0. If subroutines and interrupts use more than 32 stack locations,
the stack pointer wraps around to address $00FF and begins writing
over the previously stored data. A subroutine call uses two stack
locations; an interrupt uses five locations.
Bit 15
14
13
12
11
10
9
8
7654321
Bit 0
Read:
00000000111
Write:
Reset:
0000000011111111
Figure 3-4. Stack Pointer (SP)
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