W78LE58_06 Datasheet, PDF (11/34 Pages) Winbond – 8-BIT MICROCONTROLLER

W78LE58/W78L058A
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
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.
P4 REGISTER
P4.x
READ
WRITE
P4xCSINV
DATA I/O
RD_CS
MUX 4->1
WR_CS
RD/WR_CS
ADDRESS BUS
EQUAL
REGISTER
P4xAL
P4xAH
Bit Length
Selectable
comparator
REGISTER
P4xCMP0
P4xCMP1
P4xFUN0
P4xFUN1
P4.x INPUT DATA BUS
PIN
P4.x
In-System Programming (ISP) Mode
The W78L058A equips one 32K byte of main ROM bank for application program (called APROM) and
one 4K byte of auxiliary ROM bank for loader program (called LDROM). In the normal operation, the
microcontroller executes the code in the APROM. If the content of APROM needs to be modified, the
W78L058A allows user to activate the In-System Programming (ISP) mode by setting the CHPCON
register. The CHPCON is read-only by default, software must write two specific values 87H,
then 59H sequentially to the CHPENR register to enable the CHPCON write attribute. Writing
CHPENR register with the values except 87H and 59H will close CHPCON register write
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Publication Release Date: December 4, 2006
Revision A6