hd66421 Renesas Electronics Corporation., hd66421 Datasheet - Page 31

• Manufacturer Part Number: hd66421
• Description: Ram-provided 160 Channel 4-level Grey Scale Driver For Dot Matrix Graphics Lcd
• Manufacturer: Renesas Electronics Corporation.

Power On/Off Procedure
Figure 29 shows the procedure for turning the
power supply on and off. This procedure must be
Preliminary
Set CNF, ADC, DTY1, DTY0, INC bits according to
Figure 29 Procedure for Turning Power Supply On/Off
Write data to registers and RAM as required
the operating mode (control register1 and 2)
Clear PWR,AMP bit to 0 (control register 1)
Set PWR,AMP bit to 1 (control register 1)
Clear DISP bit to 0 (control register 1)
Set DISP bit to 1 (control register 1)
Turn on power (power-on reset)
Turn off power
31
strictly followed to prevent incorrect display
because the HD66421 incorporates a power
supply circuit.
Boosting halts
Boosting starts
Power off
Rev. 1.1E '99.02.10
Power on
HD66421