W78LE365 datasheet(13/42 Pages) WINBOND

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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

P47

I/O pin

P46

I/O pin.

P45

I/O pin.

P44

I/O pin.

P43

Port 4 Data bit which outputs to pin P4.3 at mode 0.

P42

Port 4 Data bit. which outputs to pin P4.2 at mode 0.

P41

Port 4 Data bit. which outputs to pin P4.1at mode 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. P4.4−P4.7 is only available for 48

pin package.

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.

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