UPD16311 controller/driver equivalent, 1/8- to 1/16-duty fiptm vfd controller/driver.
* Many display modes (12-segment & 16-digit to 20-segment & 8-digit)
* Key scanning (12 4 matrices)
* Dimming circuit (eight steps)
* High-voltage outpu.
Inputs serial data at rising edge of shift clock, starting from lower bit. Outputs serial data at falling edge of shift clock, starting from lower bit. This is N-ch open-drain output pin. Initializes serial interface at rising or falling edge to make.
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