HT1621
RAM Mapping 32´4 LCD Controller for I/O
mC
Features
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Operating voltage : 2.4V~5.2V
Built-in 256kHz RC oscillator
External 32.768kHz crystal or 256kHz
frequency source input
Selection of 1/2 or 1/3 bias, and selection of
1/2 or 1/3 or 1/4 duty LCD applications
Internal time base frequency sources
Two selectable buzzer frequencies
(2kHz/4kHz)
Power down command reduces power
consumption
Built-in time base generator and WDT
Time base or WDT overflow output
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8 kinds of time base/WDT clock sources
32´4 LCD driver
Built-in 32´4 bit display RAM
3-wire serial interface
Internal LCD driving frequency source
Software configuration feature
Data mode and command mode
instructions
R/W address auto increment
Three data accessing modes
VLCD pin for adjusting LCD operating
voltage
General Description
The HT1621 is a 128 pattern (32´4), memory
mapping, and multi-function LCD driver. The
S/W configuration feature of the HT1621
makes it suitable for multiple LCD applica-
tions including LCD modules and display sub-
systems. Only three or four lines are required
for the interface between the host controller
and the HT1621. The HT1621 contains a power
down command to reduce power consumption.
Selection Table
HT162X
COM
SEG
Built-in Osc.
Crystal Osc.
Ö
HT1620 HT1621 HT1622 HT16220 HT1623 HT1625 HT1626 HT1627 HT16270
4
32
4
32
Ö
Ö
8
32
Ö
Ö
8
32
8
48
Ö
Ö
8
64
Ö
Ö
16
48
Ö
Ö
16
64
Ö
Ö
16
64
1
April 21, 2000
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
