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| HD6433832S Datasheet, PDF (334/560 Pages) Renesas Technology Corp – single-chip microcomputers | |||
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VCC
V1
V2
V3
VSS
Figure 13.2 LCD Driver Power Supply Processing at 1/2 Duty
⢠Large-panel display
Because of the large impedance of the built-in resistive voltage divider, the H8/3834 Series
LCD controller/driver is not well suited to driving large-panel displays. If use of a large panel
leads to an unclear display, refer to 13.3.5 Boosting the LCD Driver Power Supply. At static
and 1/2 duty it is possible to boost the common output driving capacity. Set bit CMX to 1
when selecting the duty cycle. In this mode, at static duty pins COM4 to COM1 output the same
waveform, while at 1/2 duty pins COM2 and COM1 output the COM1 waveform and pins
COM4 and COM3 output the COM2 waveform.
⢠Segment expansion
The HD66100 can be connected externally to expand the number of segments. See 13.3.3,
Connection to HD66100.
Software Settings
⢠Duty cycle selection
The duty cycle is selected in bits DTS1 and DTS0, with a choice of static, 1/2, 1/3, or 1/4 duty.
⢠Segment driver selection
The segment drivers to be used are selected in bits SGS3 to SGS0.
⢠Frame frequency selection
The frame frequency is selected in bits CKS3 to CKS0. The frame frequency should be
selected depending on the specification of the LCD panel to be used. Refer to 13.3.4,
Operation in Power-Down Modes, for information on clock selection in watch mode, subactive
mode, and subsleep mode.
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