HT9580 Datasheet, PDF (23/63 Pages) Holtek Semiconductor Inc – Character Pager Controller

Preliminary
HT9580
²LCD-CHIP0² and ²LCD-CHIP1² Truth Table
LCD-CHIP0=²0²
LCD-CHIP0=²1²
LCD-CHIP1=²0²
SED15X(KSX)
selected
series
LCD
driver
is
MC141X series LCD driver is selected
LCD-CHIP1=²1² HD66410 LCD driver is selected
N/A
²LCD_CL² Truth Table
LCD-CHIP0=²0²
LCD-CHIP1=²0² LCD_CL: 2 kHz output
LCD-CHIP1=²1² LCD_CL: 10.9kHz output
LCD-CHIP0=²1²
LCD_CL: If ²LCD-CLK²=0, 32 kHz output
If ²LCD-CLK²=1, X1-clock output
N/A
The following is a comparison table of the HT9580 pin description between the SED15X (KSX) series
and the MC141X series LCD driver.
HT9580
(Pin)
SED15X(KSX) Series
MC141X Series
LCD_A0 A0
Data/command select input.
A0=0: Display control data on
D0~D7
D/C
A0=1: Display data on D0~D7
This input pin acknowledges
valid data on D0~D7. If high
then D0~D7 contains dis-
play data, if low D0~D7 con-
tains command data.
LCD_CS0
CS (Master)
Active low chip
(Master)
select
input.
CE (Master)
When high, enables the
control pins on the driver.
(Master)
LCD_CS1 CS (Slave)
Active low
(Slave)
chip
select
input.
CE (Slave)
When high, enables the
control pins on the driver.
(Slave)
D0~D7 D0~D7
8-bit, tristate, bidirectional I/O
bus.
D0~D7
Bidirectional bus for
data/command transfer.
LCD_E E
Enable clock input
This pin is normal low
CS
clock input. Data on
D0~D7 is latched at the
falling edge of CS.
LCD_RW R/W
Read/write input
R/W
To read the display data
RAM or the internal sta-
tus, pull this pin high.
The pin low indicates a
write operation.
LCD_CL CL
External clock input.
(2kHz output from HT9580)
OSC2
Oscillator input for external
clock is used. (32kHz or
X1-clock output from
HT9580 as determined by
the ²LCD-CLK²).
23
April 28, 2000