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參數(shù)資料
| 型號(hào)： | DMC73C168 |
| 英文描述： | 8Bit Single Chip Microcontroller |
| 中文描述： | 8位單芯片微控制器 |
| 文件頁數(shù)： | 18/90頁 |
| 文件大小： | 742K |
| 代理商： | DMC73C168 |
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18
8Bit Single Chip Microcontroller
DMC73C167
4.4 Stack Pointer (SP)
The stack pointer(SP) is an 8-bit register in the CPU which is typically used to hold a pointer
in RAM (the register file). However, the SP can also be used as temporary data storage if a
stack is not implemented, or if the SP contents are not needed.
When a stack is implemented, the SP points to the last or top entry on the stack. The SP
is automatically incremented just before data is pushed onto the stack and automatically
decremented immediately after data is popped from the stack. Upon assertion of the
RESET function (see Section 4.8) 01h is loaded into the SP. The size of the stack can be
changed from the 255-level stack at RESET to a smaller stack by execuiting a stack
initialization program as illustrated in Figure 4-3. This feature allows the stack to be located
anywhere in the register file. The SP is initialized through the B register (R1).
Figure 4-3. Example of Stack Initialization in the Register File
4.5 Status Register (ST)
The status register(ST) is an 8-bit register in the CPU that contains three conditional status
bits : carry(C), sign(N), and zero(Z). It also contains a global interrupt enable bit(I) as shown
in Figure 4-4 below.
Figure 4-4. Status Register (ST)
Bit
Con
7
C
6
N
5
Z
4
I
3
2
1
0
Future use
C = carry out, N=sign, Z = zero, I = Interrupt enable
0001h
0002h
0003h
0004h
0005h
0006h
01h
ST
PCH
PCL
04h
PCH
PCL
06h
RF
SP
RF
SP
RF
SP
Interrupt
Call
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