HD66740 Datasheet, PDF (18/95 Pages) Hitachi Semiconductor – 112 x 80-dot Graphics LCD Controller/Driver

HD66740
Power Control
AMP: When AMP = 1, each voltage follower for V1 to V5 pins and the booster are turned on. When
AMP = 0, current consumption can be reduced while the display is not being used.
SLP: When SLP = 1, the HD66740 enters the sleep mode, where the internal operations are halted except
for the R-C oscillator, thus reducing current consumption. For details, see the Sleep Mode section. Only
the power control (AMP, SLP, and STB bits) instruction can be executed during the sleep mode.
During the sleep mode, the other RAM data and instructions cannot be updated although they are
retained.
STB: When STB = 1, the HD66740 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. Voltage follower circuit on/off (AMP = 1/0)
c. Start oscillation
During the standby mode, the other RAM data and instructions may be lost. To prevent this, they must be
set again after the standby mode is canceled.
R/W RS DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 0 0 0 0 0 1 AMP SLP STB
Figure 3 Power Control Instruction
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