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參數資料
型號: W921E880A
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-Bit Microcontroller(4位微控制器)
中文描述: 4-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數: 12/57頁
文件大小: 372K
代理商: W921E880A
W921E880A/W921C880
- 12 -
6.2.2 Stack Reg. Area
There are 8 bit stack pointers in this chip located at addresses 040H
0FFH. After a power on reset
the stack pointer will be set to 0FFH. The stack pointer will be decreased by 4 each time a CALL or
interrupt occurs, and will be increased by 4 each time the RTN or RTNI instruction is executed. The
format of the stack pointer is shown in the following table.
0FFH
0FEH
0FDH
0FCH
0FBH
0FAH
0F9H
0F8H
STACK 0
STACK 1
PC11
PC11
PC7
PC3
PC7
Z
PC3
Z
PC2
PC6
PC10
C
PC2
PC6
PC10
C
PC1
PC5
PC9
PC1
PC5
PC9
PC0
PC4
PC8
PC0
PC12
PC4
PC8
PC12
6.2.3 Working Reg. Area
The area located from 040H to 04FH is known as the Working Reg. The instruction MOV WRn, A or
MOV A, WRn can move the A reg. data to the Working reg. or move the Working reg. data to the A
reg. directly within 1 word/1 machine cycle. Unlike other direct instructions such as MOV Mx, A or
MOV A, Mx, these instructions use 2 words/2 machine cycles. Therefore, the Working reg. can
reduce the ROM program memory size and improve the control speed of the application circuit.
For arithmetic and logic operations only WR0
WR7 are available, that is only 040H to 047H can be
active.
The instructions are as follow:
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 -- 7.
相關PDF資料
PDF描述
W921E840 4-Bit Microcontroller(4位的微控制器)
W921E880 4-Bit Microcontroller(4位的微控制器)
W921F840 4-Bit Microcontroller(4位的微控制器)
W9310 Direct Sequence Spread Spectrum Transceiver(直接序列擴展頻譜收發器)
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