HD66766R Datasheet, PDF (63/97 Pages) Hitachi Semiconductor – 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors

HD66766R
Rev. 1.0-1 / September 2002
Setting flow for low power consumption instruction
Sleep Mode
Setting the sleep mode bit (SLP) to “1” puts the HD66766R in the sleep mode, where the device stops all
internal display operations, thus reducing current consumption. Specifically, LCD operation is
completely halted. Here, all the SEG (SEG1 to SEG396) and COM (COM1 to COM176) pins output
the “GND” level, resulting in no display. If the AP1-0 bits in the power control register are set to “00”
in the sleep mode, the LCD drive power supply can be turned off, reducing the total current consumption
of the LCD module.
Table 38 Comparison of Sleep Mode and Standby Mode
Function
LCD control
R-C oscillation circuit
Master/slave signal
Sleep Mode (SLP = “1”)
Turned off
Operates normally
Operation stopped
Standby Mode (STB = “1”)
Turned off
Operation stopped
Operation stopped
Standby Mode
Setting the standby mode bit (STB) to “1” puts the HD66766R 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 SEG396) and
COM (COM1 to COM176) 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 bet 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”. When multi-chips are operated, be sure to be set to the standby mode from the slave
level.
Turn off the display: D1-0 = "01"
Turn off the LCD power supply: AP1-0 = "00"
Set stand-by mode: STB = "1"
Stand-by mode
Issue the start-oscillation instruction
Wait at least 10 ms
Cancel stand-by mode: STB = "0"
Turn on the LCD power supply: AP0-1 = 01/10/11
Wait at least 150 ms
Turn on the display: D1-0 = "11"
See the power supply
circuit setting.
Procedure for Setting and Canceling Standby Mode
Figure 45 Procedure for Setting and Canceling Standby Mode
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