HD66766R Datasheet, PDF (22/97 Pages) Hitachi Semiconductor – 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors

HD66766R
Rev. 1.0-1 / September 2002
DC2-0: The operating frequency in the step-up circuit is selected. When the step-up operating
frequency is high, the driving ability of the step-up circuit becomes high, but the current consumption is
increased. Adjust the frequency considering the step-up ability and the current consumption.
AP1–0: The amount of fixed current from the fixed current source in the operational amplifier for the
LCD is adjusted. When the amount of fixed current is large, the LCD driving ability and the display
quality become high, but the current consumption is increased. Adjust the fixed current considering the
display quality and the current consumption. During no display, when AP1-0 = “00”, the current
consumption can be reduced by ending the operational amplifier and step-up circuit operation.
VC2-0: Set an adjustment factor for the Vci1 voltage (VC2-0).
SLP: When SLP = 1, the HD66766R enters the sleep mode, where the internal display operations are
halted except for the R-C oscillator, thus reducing current consumption. Only the following instructions
can be executed during the sleep mode.
Power control (BS2–0, BT3-0, DC2–0, AP1–0, SLP, STB)
During the sleep mode, the other GRAM data and instructions cannot be updated although they are
retained.
STB: When STB = 1, the HD66766R enters the standby mode, where display operation completely stops,
halting all the internal operations including the internal R-C oscillator. Further, no external clock pulses
are supplied. For details, see the Standby Mode section. Only the following instructions can be
executed during the standby mode.
a. Standby mode cancel (STB = “0”)
b. Start oscillation
During the standby mode, the GRAM data and instructions may be lost. To prevent this, they must be
set again after the standby mode is canceled.
The VSH voltage should be controlled to be less than supply voltage or device proof voltage level since
VCH voltage level is generated by bias amplifier ratio corresponding to LCD driving bias value and
boosting ratio of the step-up circuit 2.
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