HD6473887 Datasheet, PDF (372/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

2. Software settings
a. Duty selection
Any of four duty cycles—static, 1/2 duty, 1/3 duty, or 1/4 duty—can be selected with bits
DTS1 and DTS0.
b. Segment selection
The segment drivers to be used can be selected with bits SGS₃ to SGS₀.
c. Frame frequency selection
The frame frequency can be selected by setting bits CKS₃ to CKS₀. The frame frequency
should be selected in accordance with the LCD panel specification. For the clock selection
method in watch mode, subactive mode, and subsleep mode, see 13.3.6, Operation in
Power-Down Modes.
d. A or B waveform selection
Either the A or B waveform can be selected as the LCD waveform to be used by means of
LCDAB.
e. LCD drive power supply selection
When the on-chip power supply circuit is used, the power supply to be used can be selected
with the SUPS bit. When an external power supply circuit is used, select V_CC with the
SUPS bit and turn the LCD drive power supply off with the PSW bit.
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