参数资料
型号: MC68HC05J1AVDWR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 55/126页
文件大小: 1118K
代理商: MC68HC05J1AVDWR2
Technical Data
MC68HC05J1A — Rev. 1.0
34
Central Processor Unit (CPU)
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
987654321
Bit
0
Read:
0000000011000000
Write:
Reset:
0000000011111111
= Unimplemented
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