HD66766R Datasheet, PDF (21/97 Pages) Hitachi Semiconductor – 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors

HD66766R
LCD-Driving-Waveform Control (R02h)
Rev. 1.0-1 / September 2002
R/W RS DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
W1 0 0
00
0 RST B/C EOR 0 0 NW5 NW4 NW3 NW2 NW1 NW0
Figure 8 LCD-Driving-Waveform Control Instruction
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 NW4–NW0 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 number of the LCD drive duty ratio and the n raster-row.
For details, see the n-raster-row Reversed AC Drive section.
RST: When RST = 1, software reset function is started. This function is the same as hardware RESET
pin. It takes 10 clock cycle period. This bit is automatically cleared after reset function is completed.
Therefore, before 10-clock cycle other instruction can not be issued. Do not set the RST bit during
stand-by mode.
NW5–0: Specify the number of raster-rows n that will alternate at the C-pattern waveform setting (B/C =
1). NW5–NW0 alternate for every set value + 1 raster-row, and the first to the 64th raster-rows can be
selected.
Power Control 1 (R03h)
Power Control 2 (R0Ch)
Figure 9 Power Control Instruction
BS3-0: The LCD drive bias value is set. The LCD drive bias value can be selected according to its drive
duty ratio and voltage.
BT2–0: The output factor of step-up circuit is switched. The LCD drive voltage level can be selected
according to its drive duty ratio and bias. Lower amplification of the step-up circuit consumes less
current.
BT3: Operation/halt of voltage inverting circuit is set. BT3=”0”: voltage-inverting circuit is halted.
BT3=”1”: voltage-inverting circuit is operated. See the Power-on/off Sequence section to be activated.
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