HT1621 controller equivalent, ram mapping 32 x 4 lcd controller.
* 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 bia.
* Internal time base frequency sources
* Two selectable buzzer frequencies (2kHz/4kHz)
* Power down command .
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