Product Features

• CPU Features

  • 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

  • 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

  • HT1621: 44-pin LQFP package

  HT1621B: 48-pin SSOP/LQFP packages

  HT1621G: Gold bumped chip