UPD753012GC NEC, UPD753012GC Datasheet - Page 33

• Manufacturer Part Number: UPD753012GC
• Description: 4-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

6.9 LCD Controller/Driver
the display data memory contents and incorporates segment and common drivers which can drive the LCD panel
directly.
The PD753017 incorporates a display controller which generates segment and common signals according to
The PD753017 LCD controller/driver functions are as follows:
• Display data memory is read automatically by DMA operation and segment and common signals are
• Display mode can be selected from among the following five:
• A frame frequency can be selected from among four in each display mode.
• A maximum of 32 segment signal output pins (S0-S31) and four common signal output pins (COM0-COM3).
• The segment signal output pins (S24-S27 and S28-S31) can be changed to the output ports in 4-pin units.
• Split-resistor can be incorporated to supply LCD drive power. (Mask option)
• Display data memory not used for display can be used for normal data memory.
• It can also operate by using the subsystem clock.
generated.
<1> Static
<2> 1/2 duty (time multiplexing by 2), 1/2 bias
<3> 1/3 duty (time multiplexing by 3), 1/2 bias
<4> 1/3 duty (time multiplexing by 3), 1/3 bias
<5> 1/4 duty (time multiplexing by 4), 1/3 bias
· Various bias methods and LCD drive voltages can be applicable.
· When display is off, current flow to the split resistor is cut.
PD753012, 753016, 753017
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