hd66420 Renesas Electronics Corporation., hd66420 Datasheet - Page 36

• Manufacturer Part Number: hd66420
• Description: Ram-provided 160 Channel 4-level Grey Scale Driver For Dot Matrix Graphics Lcd
• Manufacturer: Renesas Electronics Corporation.

HD66420
Power On/Off Procedure
Figure 22 shows the procedure for turning the power supply on and off. This procedure must be strictly
followed to prevent incorrect display because the HD66420 incorporates a power supply circuit.
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Set CNF, ADC, DTY1, DTY0, INC bits according to
Write data to registers and RAM as required
the operating mode (control register1 and 2)
Clear DISP bit to 0 (control register 1)
Clear PWR bit to 0 (control register 1)
Set DISP bit to 1 (control register 1)
Set PWR bit to 1 (control register 1)
Turn on power (power-on reset)
Figure 22 Procedure for Turning Power Supply On/Off
Turn off power
Boosting halts
Boosting starts
Power on
Power off