Hardware Reference
In-Depth Information
HD44780U-based
LCD Module
HCS12 MCU
5 V
PK0
RS
E
R/W
PK1
V
CC
5 V
V
EE
PK5...PK2
DB7..DB4
GND
Figure 7.28
■
LCD interface example (4-bit bus, used in
Dragon12)
RS
t
AH
t
AS
R/W
PW
EH
t
Ef
E
t
Er
t
DDR
t
DHR
Valid data
DB0-DB7
t
CYCLE
Figure 7.29
■
HD44780U LCD controller read timing
diagram
RS
t
AH
t
AS
R/W
PW
EH
t
Ef
E
t
DSW
t
Er
t
H
Valid data
DB0-DB7
t
CYCLE
Figure 7.30
■
HD44780U LCD controller write timing diagram
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