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 256 kHz frequency source input Selection of 1/2 or 1/3 bias, and selection of 1.
Internal time base frequency sources Two selectable buzzer frequencies (2kHz/4kHz) Power down command reduces power cons.
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