HOLTEK
HT1621
RAM Mapping 32x4 LCD Controller for I/O uC
 

 Features
Operating voltage : 2.4V~5.2V Time base or WDT overflow output
Built-in 256kHz RC oscillator 8 kinds of time base/WDT clock sources
External 32.768kHz crystal or 256kHz ------------ 32x4 LCD driver
---frequency source-input Built-in 32x4 bit display RAM
Selection of 1/2 or 1/3 bias, and selection of 3-wire serial interface
---1/2 or 1/3 or -1/4 duty LCD applications Internal LCD driving frequency source
Internal time base frequency sources Software configuration feature
Two selectable buzzer frequencies(2kHz/4kHz) Data mode and command mode instructions
Power down command reduces power consumption R/W address auto increment
Built-in time base generator and WDT Three data accessing modes
VLCD pin for adjusting LCD operating voltage  
 General Description
---The HT1621 is a 128 pattern (32x4), memory mapping, and multi-function LCD driver.
---The S/Wconfiguration feature of the HT1621 makes it suitable for multiple LCD applications including
LCD modules and display subsystems. Only three or four lines are required for the interface between
the hostcontroller and the HT1621. The HT1621 contains a power down command to reduce power
consumption.