HD66760 Datasheet, PDF (82/105 Pages) Hitachi Semiconductor – 104 X 80-dot Graphics LCD Controller/Driver for 256 Colors

HD66760
Standby Mode
Setting the standby mode bit (STB) to 1 puts the HD66760 in the standby mode, where the device stops
completely, halting all internal operations including the R-C oscillation circuit, thus further reducing current
consumption compared to that in the sleep mode. Specifically, all the SEG (SEG1 to SEG312) and COM
(COM1 to COM80) pins for the time-sharing drive output the GND level, resulting in no display. If the AP1–
0 bits are set to 00 in the standby mode, the LCD drive power supply can be turned off.
During the standby mode, no instructions can be accepted other than the start-oscillation instruction. To
cancel the standby mode, issue the start-oscillation instruction to stabilize R-C oscillation before setting the
STB bit to 0.
Turn off the display: D1 to 0 = 01
Turn off the LCD power supply: AP1 to 0 = 00
Set standby mode: STB = 1
Standby mode
Issue the start-oscillation instruction
Wait at least 5 ms
Cancel standby mode: STB = 0
Turn on the LCD power supply: AP1 to 0 = 01/10/11
Wait at least 150 ms
Turn on the display: D1 to 0 = 11
Figure 55 Procedure for Setting and Canceling Standby Mode