CHAPTER 3 LCD CONTROLLER/DRIVER
User’s Manual U18438EJ2V0UD
23
(2) LCD display mode register (LCDM)
LCDM specifies whether to enable display operation. It also specifies whether to enable segment
pin/common pin output, booster circuit operation, and the display mode.
LCDM is set using an 8-bit memory manipulation instruction.
Reset signal generation sets LCDM to 00H.
Figure 3-6. Format of LCD Display Mode Register
Address: LCDCTL's 01H
After reset:
00H R/W
Symbol
7 6 5 4 3 2 1 0
LCDM LCDON
SCOC
VLCON
0
0
LCDM2
LCDM1
LCDM0
LCDON
LCD display enable/disable
0
Display off (all segment outputs are deselected.)
1
Display
on
SCOC
Segment pin/common pin output control
Note
0
Output ground level to segment/common pin
1
Output deselect level to segment pin and LCD waveform to common pin
VLCON
Booster
circuit operation enable/disable
Note
0
No internal voltage boosting
1
Internal voltage boosting enabled
LCD controller/driver display mode selection
Resistance division method
Voltage boosting method
LCDM2 LCDM1 LCDM0
Number of
time slices
Bias mode
Number of
time slices
Bias mode
0 0 0
4
1/3 4
1/3
0 0 1
3
1/3 3
1/3
0 1 0
2
1/2 4
1/3
0 1 1
3
1/2 3
1/3
1 0 0
Static
Setting
prohibited
Other than above
Setting prohibited
Note
When the LCD display panel is not used, SCOC and VLCON must be set to 0 to conserve power.