Datasheet

RL78/L12 CHAPTER 14 LCD CONTROLLER/DRIVER
R01UH0330EJ0200 Rev.2.00 632
Dec 13, 2013
14.7 Operation stop procedure
To stop the operation of the LCD while it is displaying waveforms, follow the steps shown in the flowchart below.
The LCD stops operating when the LCDON bit of LCDM1 register and SCOC bit of the LCDM1 register are set to “0”.
Figure 14-21. Operation Stop Procedure
(a) During normal liquid crystal waveform (waveform A or B) display
SCOC bit of LCDM1 register = 0
(Common/segment pins output ground signal. Segment pin outputs deselect signal.)
END
Internal voltage boosting method/
capacitor split method?
No
Yes
LCDON and SCOC bits can be
set together.
LCDON bit of LCDM1 register = 0
(Display data off. Segment pin outputs deselect signal.)
VLCON bit of LCDM1 register = 0
(Voltage boost circuit/capacitor split circuit stop operating.)
MDSET1 and MDSET0 bits of LCDM0 register = 00B
(The external resistance division method is selected.)
Caution Stopping the voltage boost/capacitor split circuits is prohibited while the display is on (SCOC and
LCDON bits of LCDM1 register = 00B). Otherwise, the operation will not be guaranteed. Be sure to
turn off display (SCOC and LCDON bits of LCDM1 register = 00B) before stopping the voltage
boost/capacitor split circuits (VLCON bit of LCDM1 register = 0).