參數(shù)資料
型號： W78L365A24PL
廠商： WINBOND ELECTRONICS CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQCC44
封裝： ROHS COMPLIANT, PLASTIC, LCC-44
文件頁數(shù)： 13/42頁
文件大?。?/td> 474K
代理商： W78L365A24PL
W78LE365/W78L365A
Publication Release Date: January 10, 2007
- 13 -
Revision A7
5.6.3
Port 4 Base Address Registers
P40AH, P40AL:
The Base address register for comparator of P4.0. P40AH contains the high-order byte of address,
P40AL contains the low-order byte of address.
P41AH, P41AL:
The Base address register for comparator of P4.1. P41AH contains the high-order byte of address,
P41AL contains the low-order byte of address.
P42AH, P42AL:
The Base address register for comparator of P4.2. P42AH contains the high-order byte of address,
P42AL contains the low-order byte of address.
P43AH, P43AL:
The Base address register for comparator of P4.3. P43AH contains the high-order byte of address,
P43AL contains the low-order byte of address.
P4 (D8H)
BIT
NAME
FUNCTION
7
6
5
4
3
2
1
0
P47
P46
P45
P44
P43
P42
P41
P40
I/O pin
I/O pin.
I/O pin.
I/O pin.
Port 4 Data bit which outputs to pin P4.3 at mode 0.
Port 4 Data bit. which outputs to pin P4.2 at mode 0.
Port 4 Data bit. which outputs to pin P4.1at mode 0.
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. P4.4
P4.7 is only available for 48
pin package.
MOV P40AH, #12H
MOV P40AL, #34H
MOV P4CONA, #00001010B
MOV P4CONB, #00H
MOV P2ECON, #10H
; Base I/O address 1234H for P4.0
; P4.0 a write strobe signal and address line A0 and A1 are masked.
; P4.1
P4.3 as general I/O port which are the same as PORT1
; 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.
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