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13.3.10 Power-On and Power-Off Procedures
As the LCD controller incorporates a complete power supply circuit, the procedures shown in
figure 13.13 must be followed when powering on and off. Failure to follow these procedures may
result in an abnormal display.
Starting
display
Set PWR and OPON* to 1
Set SOB, DDTY1, and DDTY0
according to mode used
Halting
display
Clear PWR and OPON to 0
Write data
Set DISP to 1
Clear DISP to 0
Figure 13.13 Power-On and Power-Off Procedures
13. Dot Matrix LCD Controller (H8/3857 Group)
Step-up operation starts
Note: * When the built-in step-up circuit is used,
wait for the step-up circuit power supply to
stabilize before making this setting.
Do not make this setting when using an
external power supply.
Step-up operation halts
Rev.3.00 Jul. 19, 2007 page 361 of 532
REJ09B0397-0300
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