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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: 18/68頁
文件大小: 451K
代理商: W921F840
W921F840
- 18 -
The input or output mode of port A to port D only can be decided by I/O instructions. For example,
MOV A, Px will change Px to input mode and MOV Px, A will change it to output mode.
6.5.1 Normal/Special Function Selection of I/O
Some of the I/O ports can be programed to special function via special control register. The detail
function are descirbed as follows:
ù
P2.0 to P2.3: Four 15mA sink current normal I/O pins only
ù
P3.0 to P3.3: Multi-function I/O pins (selected by P3IO register)
Normal function I/O pins
Special function I/O pins
P3IO register: (address = 00FH, default data = 0H)
b3
b2
b1
b0
0:
1:
0:
1:
0:
1:
0:
1:
Normal I/O P3.0
Analog input pin 0 (ANI0)
Normal I/O P3.1
Analog input pin 1 (ANI1)
Normal I/O P3.2
Analog input pin 2 (ANI2)
Normal I/O P3.3
Analog input pin 3 (ANI3)
ù
P4.0 to P4.3: Multi-function I/O pins (selected by P4IO register)
Normal function I/O pins
Special function I/O pins:
P4IO register: (address = 010H, default data = 0H)
b3
b2
b1
b0
0:
1:
0:
1:
0:
1:
0:
1:
INT0
Normal I/O P4.0, interrupt disable
Interrupt port P4.0
Interrupt port P4.1
Interrupt port P4.2
Normal I/O P4.3, interrupt disable
Normal I/O P4.2, interrupt disable
Normal I/O P4.1, interrupt disable
ù
P5.0 to P5.3: Multi-function I/O pins (selected by P5IO register)
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