UPD75316BGC datasheet(26/77 Pages) NEC

26 / 77 page

µPD75312B, 75316B

5.8

LCD CONTROLLER/DRIVER

The

µPD75316B has an on-chip display controller which generates segment signals and common signals in

accordance with data in display data memory as well as a segment driver and common driver capable of directly

driving the LCD panel.

The configuration of the LCD controller/driver is shown in Fig. 5-7.

The functions of the LCD controller/driver are as follows.

• Display data memory are read automatically through DMA operations and segment signals and common

signals are generated.

• 5 different display modes can be selected.

1 Static

2 1/2 duty (1/2 bias)

3 1/3 duty (1/2 bias)

4 1/3 duty (1/3 bias)

5 1/4 duty (1/3 bias)

• In each of the display modes, 4 types of frame frequency can be selected.

• The segment signal output is a maximum of 32 segments (S0 to S31) and 4 common outputs (COM0 to

COM3).

• Segment signal outputs (S24 to S27, S28 to S31) are in 4-segment units and they can be switched for use

as output ports (BP0 to BP3, BP4 to BP7).

• Split resistors can be incorporated for the LCD drive power supply (mask option).

•

Conformity to various bias methods and LCD drive voltages is possible.

•

When the display is OFF, the current flowing to the split resistors is cut.

• Display data memory not used for the display can be used as ordinary data memory.

• Operation by the subsystem clock is also possible.

UPD75316BGC 数据表(PDF) 26 Page - NEC