tc94a23f TOSHIBA Semiconductor CORPORATION, tc94a23f Datasheet - Page 5

• Manufacturer Part Number: tc94a23f
• Description: Single-chip Cd Processor With Built-in Controller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Pin Function
Number
100
Pin
97
98
99
COM1/OT1
COM2/OT2
COM3/OT3
COM4/OT4
Symbol
LCD common output
/output port
Pin Name
Common signal output pins for the LCD panel.
Those pins configure matrix with S1 to S18
and display up to 72 segments.
The LCD can be driven by the 1/2 or 1/3 bias
method. When the 1/2 bias method is set,
three levels, MV
output at 2-ms intervals at a 62.5 Hz cycle.
When the 1/3 bias method is set, four levels,
MV
output at 1-ms intervals at a 125 Hz cycle
(when either the 4.5 MHz or 75 kHz crystal
oscillator is used).
After system reset or clock stop execution is
released, the non-selected waveform (bias
voltage) is output. The DISP OFF bit is set to
0 and the common signal is output.
These pins can be switched to an output port
(Note 1) or LED driver pins by program. They
are usually used for digit output to drive the
LEDs.
DD
, 1/3MV
Function and Operation
DD
5
DD
, 2/3MV
, 1/2MV
DD
DD
, and GND, are
, and GND, are
MV
DD
Remarks
TC94A23F
MV
2002-02-06
DD
Bias
voltage