2.2 Interface Pin Description
Pin No.
1
2
3
Symbol
V
SS
V
DD
V
O
Signal Description
Power Supply (V
SS
=0)
Power Supply (V
DD
>V
SS
)
NC.
Register Selection input
High = Data register
Low = Instruction register (for write)
Busy flag address counter (for read)
Read/Write signal input is used to select the read/write
mode
High = Read mode,
Low = Write mode
Start enable signal to read or write the data
Four low order bi-directional three-state data bus lines. Use
for data transfer between the MPU and the LCD module.
These four are not used during 4-bit operation.
Four high order bi-directional three-state data bus lines.
Used for data transfer between the MPU and the LCD
module.
DB7 can be used as a busy flag.
4
RS
5
6
7~10
R/W
E
DB0 ~ DB3
11~14
DB4 ~ DB7
A
K
Backlight Controll
Power supply for LED B/L(+)
Power supply for LED B/L(-)
LCD MODULE
A
K
4.2V
PC1602LRS-LWA-H-YM Ver.0 (DK)
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