SIC63616-(Rev. 1.0) NO. P65
3240-0412
4.6.3 Controlling LCD display
(1) Selecting display mode
In addition to the LPWR register for turning the display on and off, the DSPC0–DSPC1 register is pro-
vided to select a display mode. There are four display modes available as shown in Table 4.6.3.1.
Table 4.6.3.1 Display mode
DSPC1
1
1
0
0
Display mode
All white mode
All black mode
Reverse mode
Normal mode
DSPC0
1
0
1
0
Normal mode: The screen image written in the display RAM is output without being processed.
(default)
Reverse mode: The screen image written in the display RAM is output in reverse video. The con-
tents in the display RAM are not modified.
All black mode: Turns all the LCD pixels on (black when normal white LCD is used) in static drive.
The contents in the display RAM are not modified.
All white mode: Turns all the LCD pixels off (white when normal white LCD is used) in dynamic
drive. The contents in the display RAM are not modified.
(2) Drive duty and frame frequency
The S1C63616 supports three types of LCD drive duty settings, 1/32, 1/24 and 1/16, and can be
switched using the LDUTY2–LDUTY0 register as shown in Table 4.6.3.2. Select an appropriate drive
duty according to the LCD panel to be used.
The frame frequency is determined by the selected duty and the clock supplied from the clock manager.
The clock to be supplied (8 Hz to 32 Hz) can be selected using the FLCKS0–FLCKS1 register.
Selecting a low frame frequency can reduce current consumption.
Note: The frame frequency affects the display quality, therefore, it should be determined after the display
quality is evaluated using the actual LCD panel.
Table 4.6.3.2 Combination of frame frequency and duty
Drive bias
(mask option)
–
–
–
1/4 bias
1/5 bias
1/5 bias
–
1/5 bias
LDUTY2
1
1
1
1
0
0
0
0
LDUTY1
1
1
0
0
1
1
0
0
LDUTY0
1
0
1
0
1
0
1
0
Duty
Prohibited
Prohibited
Prohibited
1/16
1/24
1/24
Prohibited
1/32
FLCKS = 11B
–
–
–
8 Hz
5.333 Hz
10.666 Hz
–
8 Hz
FLCKS = 10B
–
–
–
16 Hz
10.666 Hz
21.333 Hz
–
16 Hz
FLCKS = 01B
–
–
–
21.333 Hz
14.22 Hz
28.44 Hz
–
21.333 Hz
FLCKS = 00B
–
–
–
32 Hz
21.333 Hz
42.666 Hz
–
32 Hz
Frame frequency
Table 4.6.3.3 shows the relationship of the drive duty setting, available SEG/COM terminals and the
maximum number of pixels.
Table 4.6.3.3 Drive duty setting, SEG/COM terminals and the maximum number of pixels
Terminal
Duty
1/32
1/24
1/16
Number of pixels
1,280
1,152
896
COM15–COM0
COM15–COM0
COM15–COM0
COM15–COM0
COM23–COM16
COM23–COM16
COM23–COM16
SEG48–SEG55
SEG0–SEG39
SEG0–SEG39
SEG0–SEG39
SEG0–SEG39
COM31–COM24
COM31–COM24
SEG40–SEG47
SEG40–SEG47
The respective drive waveforms are shown in Figures 4.6.3.1 to 4.6.3.3.