HD66750 Datasheet, PDF (23/96 Pages) Hitachi Semiconductor – 128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions

HD66750/1
LCD-Driving-Waveform Control
B/C: When B/C = 0, a B-pattern waveform is generated and alternates in every frame for LCD drive. When
B/C = 1, a C-pattern waveform is generated and alternates in each raster-row specified by bits EOR and
NW4ÐNW0 in the LCD-driving-waveform control register. For details, see the n-raster-row Reversed AC
Drive section.
EOR: When the C-pattern waveform is set (B/C = 1) and EOR = 1, the odd/even frame-select signals and
the n-raster-row reversed signals are EORed for alternating drive. EOR is used when the LCD is not
alternated by combining the set values of the LCD drive duty ratio and the n raster-row. For details, see the
n-raster-row Reversed AC Drive section.
NW4Ð0: Specify the number of raster-rows n that will alternate at the C-pattern waveform setting (B/C =
1). NW4ÐNW0 alternate for every set value + 1 raster-row, and the first to the 32nd raster-rows can be
selected.
R/W RS DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 1 * * * * * * * * * B/C EOR NW4 NW3 NW2 NW1 NW0
Figure 5 LCD-Driving-Waveform Control Instruction
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