PEDL9041A-02
OKI Semiconductor
ML9041A-xxA/xxB
PIN DESCRIPTIONS
Symbol
R/W
Description
The input pin with a pull-up resistor to select Read (“H”) or Write (“L”) in the Parallel I/F
Mode.
This pin should be open in the Serial l/F Mode.
The input pins with a pull-up resistor to select a register in the Parallel l/F Mode.
RS
1
RS
0
H
L
L
Name of register
Data register
Instruction register
Expansion Instruction register
RS
0
, RS
1
H
H
L
This pin should be open in the Serial I/F Mode.
E
The input pin for data input/output between the CPU and the ML9041A and for
activating instructions in the Parallel l/F Mode.
This pin should be open in the Serial l/F Mode.
The input/output pins to transfer data of lower-order 4 bits between the CPU and the
ML9041A in the Parallel l/F Mode. The pins are not used for the 4-bit interface and
serial interface.
Each pin is equipped with a pull-up resistor, so this pin should be open when not used.
The input/output pins to transfer data of upper 4 bits between the CPU and the
ML9041A in the Parallel l/F Mode. The pins are not used for the serial interface.
Each pin is equipped with a pull-up resistor, so this pin should be open in the Serial I/F
Mode when not used.
The clock oscillation pins required for LCD drive signals and the operation of the
ML9041A by instructions sent from the CPU.
OSC
1
OSC
2
OSC
R
To input external clock, the OSC
1
pin should be used. The OSC
R
and the OSC
2
pins
should be open.
To start oscillation with an external resistor, the resistor should be connected between
the OSC
1
and OSC
2
pins. The OSC
R
pin should be open.
To start oscillation with an internal resistor, the OSC
2
and OSC
R
pins should be
short-circuited outside the ML9041A. The OSC
1
pin should be open.
The LCD common signal output pins.
COM
1
to COM
17
SEG
1
to SEG
100
For 1/9 duty, non-selectable voltage waveforms are output via COM
10
to COM
17
. For
1/12 duty, non-selectable voltage waveforms are output via COM
13
to COM
17
.
The LCD segment signal output pins.
DB
0
to DB
3
DB
4
to DB
7
4/64
OKI [ OKI ELECTRONIC COMPONETS ]
