hd66740 Renesas Electronics Corporation., hd66740 Datasheet - Page 71

• Manufacturer Part Number: hd66740
• Description: 112 X 80-dot Graphics Lcd Controller/driver - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

Standby Mode
Setting the standby mode bit (STB) to 1 puts the HD66740 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, character and segment displays,
which are controlled by the multiplexing drive method, are completely halted. Here, all the SEG (SEG1
to SEG112) and COM (COM1 to COM80) pins output the GND level, resulting in no display. If the
AMP bit is set to 0 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. To cancel the
standby mode, issue the start-oscillation instruction to stabilize R-C oscillation before setting the STB bit
to 0.
Figure 40
Turn on the LCD drive power supply: AMP = 1
Turn off the LCD power supply: AMP = 0
Procedure for Setting and Canceling Standby Mode
Issue the start-oscillation instruction
Cancel standby mode: STB = 0
Set standby mode: STB = 1
Wait at least 10 ms
Standby mode
71
HD66740