参数资料
型号: W78E365
厂商: Electronic Theatre Controls, Inc.
元件分类: 8位微控制器
英文描述: 8-BIT MICROCONTROLLER
中文描述: 8位微控制器
文件页数: 5/40页
文件大小: 395K
代理商: W78E365
W78E365
Publication Release Date: April 20, 2005
- 13 -
Revision A5
P4 (D8H)
BIT
NAME
FUNCTION
7
P47
I/O pin
6
P46
I/O pin.
5
P45
I/O pin.
4
P44
I/O pin.
3
P43
Port 4 Data bit which outputs to pin P4.3 at mode 0.
2
P42
Port 4 Data bit. which outputs to pin P4.2 at mode 0.
1
P41
Port 4 Data bit. which outputs to pin P4.1at mode 0.
0
P40
Port 4 Data bit which outputs to pin P4.0 at mode 0.
Here is an example to program the P4.0 as a write strobe signal at the I/O port address 1234H
1237H and positive polarity, and P4.1
P4.3 are used as general I/O ports.
MOV P40AH, #12H
MOV P40AL, #34H
; Base I/O address 1234H for P4.0
MOV P4CONA, #00001010B
; P4.0 a write strobe signal and address line A0 and A1 are masked.
MOV P4CONB, #00H
; P4.1
P4.3 as general I/O port which are the same as PORT1
MOV P2ECON, #10H
; Write the P40SINV = 1 to inverse the P4.0 write strobe polarity
; default is negative.
Then any instruction MOVX @DPTR, A (with DPTR = 1234H
1237H) will generate the positive
polarity write strobe signal at pin P4.0. And the instruction MOV P4, #XX will output the bit3 to bit1 of
data #XX to pin P4.3
P4.1.
ADDRESS BUS
Bit Length
Selectable
comparator
REGISTER
P4xAL
P4xAH
EQUAL
P4.x
MUX 4->1
P4 REGISTER
P4.x
READ
WRITE
DATA I/O
RD_CS
WR_CS
RD/WR_CS
P4xCMP0
P4xCMP1
P4xFUN0
P4xFUN1
P4xCSINV
P4.x INPUT DATA BUS
REGISTER
PIN
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