hd66420 Renesas Electronics Corporation., hd66420 Datasheet - Page 36
hd66420
Manufacturer Part Number
hd66420
Description
Ram-provided 160 Channel 4-level Grey Scale Driver For Dot Matrix Graphics Lcd
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.HD66420.pdf
(52 pages)
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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.
36
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
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