HD66421 Datasheet, PDF (6/46 Pages) Hitachi Semiconductor – (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)

Preliminary
Rev. 1.1E '99.02.10
HD66421
Pin Description
Number
Pin Name
of Pins
Vcc1-6, GND1-6 12
VLCD1-4
4
V1O, V2O,
5
V3O,V4O,
V5O
OSC
1
OSC1,OSC2
2
CO
1
DCON
1
CL1
1
FLM
1
M
1
M/S
1
RES
1
CS
1
RS
1
WR
1
RD
1
DB7 to DB0
8
SEG1 to
160
SEG160
COM1 to
100
COM100
IREFP
1
IREFM
1
GREF
1
I/O Connected to
- Power supply
- Power supply
- V1 to V5 of
HD66421
I, Oscillator
I/O resister or
external clock
O OSC of Slave
HD66421
O External DC/DC
convertor
I/O CL1 of HD66421
I/O FLM of HD66421
I/O M of HD66421
I Vcc or GND
I-
I MPU
I MPU
I MPU
I MPU
I/O MPU
O LCD
O LCD
- VCC
- _{External resistor}
- GND
Description
Vcc: +2.2V to +5.5V, GND: 0V
Power supply to LCD driving circuit
Several levels of power to the LCD driving outputs.
Master HD66421 outputs these levels to the slave
HD66421.
Must be connected to external resister when using
R-C oscillation. When using an external clock, it must
be input to the OSC terminal.
Clock output
Controls on/off switch of external DC/DC convertor
Line clock
Frame signal
Converts LCD driving outputs to AC
Specifies master/slave mode.
Reset the LSI internally when drive low.
Select the LSI, specifically internal registers (index and
data registers) when driven low.
Select one of the internal registers; select the index
register when driven low and data registers when
driven low.
Inputs write strobe; allows a write access when driven
low.
Inputs read strobe; allows a read access when driven
low.
8-bits three-state bidirectional data bus; transfer data
between the HD66420 and MPU through this bus.
Output column drive signals
Output row drive signals
Power supply for internal operation amplifier
Bias current for internal operational amplifier
Power supply for internal operation amplifier
6