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參數資料
型號: W921F840
廠商: WINBOND ELECTRONICS CORP
英文描述: 4-Bit Microcontroller(4位的微控制器)
中文描述: 4位微控制器(第4位的微控制器)
文件頁數: 15/68頁
文件大小: 451K
代理商: W921F840
W921F840
Publication Release Date: October 1997
- 15 -
Revision A1
6.2.2 Stack Register Area
A 8-bit stack pointer indicates the stack located address from 040H to 0FFH. After power on reset the
stack pointer will be set to 0FFH. The stack pointer will be decreased by 4 when the CALL/ CALLP or
interrupt is accepted, and will be increased by 4 when the RTN or RTNI instruction is executed. The
format of the stack content is shown as following table.
0FFH
0FEH
0FDH
0FCH
0FBH
0FAH
0F9H
0F8H
Stack 0
Stack 1
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
PC8
PC9
PC10
PC11
Z
C
PC0
PC12
PC1
PC2
PC3
PC4
PC5
PC6
PC7
PC8
PC9
PC10
PC11
Z
C
PC12
6.2.3 Working Register Area
The located area from 040H to 04FH is known as working register. The instruction MOV WRn, A or
MOV A, WRn can move the A accumulator data to the working register or move working register data
to the A accumulator directly within the 1 word / 1 machine cycle. The other direct instructions such
as MOV Mx, A or MOV A, Mx instruction are 2 words / 2 machine cycles. Therefore the working
register can save the program memory size in ROM and improve the control speed in
μ
C application
circuit.
Only the WR0 to WR7 are available in the arithmetic and logic operation (i.e. only 040H to 047H can
be active). The instructions are as follows:
ADD
ADC
SUB
SBC
ANL
ORL
XRL
CMP
A,
A,
A,
A,
A,
A,
A,
A,
WRx
WRx
WRx
WRx
WRx
WRx
WRx
WRx
where x = 0 to 7.
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