16 lCD DRiVeR (lCD)
16-8
Seiko epson Corporation
S1C17153 TeChniCal Manual
(Rev. 1.0)
Bit
Address
COM
pin
0x
53
c0
0x
53
c1
0x
53
c2
0x
53
c3
0x
53
c4
0x
53
c5
0x
53
c6
0x
53
c7
0x
53
c8
0x
53
c9
0x
53
ca
0x
53
cb
0x
53
cc
0x
53
cd
0x
53
ce
0x
53
cf
0x
53
d0
0x
53
d1
0x
53
d2
0x
53
d3
0x
53
d4
0x
53
d5
0x
53
d6
0x
53
d7
0x
53
d8
0x
53
d9
0x
53
da
0x
53
db
0x
53
dc
0x
53
dd
0x
53
de
0x
53
df
D0
Display area
COM0
D1
Unused area (general-purpose memory)
–
D2
–
D3
–
D4
Unavailable area (0 when being read)
–
D5
–
D6
–
D7
–
SEG
pin
S
E
G
0
S
E
G
1
S
E
G
2
S
E
G
3
S
E
G
4
S
E
G
5
S
E
G
6
S
E
G
7
S
E
G
8
S
E
G
9
S
E
G
10
S
E
G
11
S
E
G
12
S
E
G
13
S
E
G
14
S
E
G
15
S
E
G
16
S
E
G
17
S
E
G
18
S
E
G
19
S
E
G
20
S
E
G
21
S
E
G
22
S
E
G
23
S
E
G
24
S
E
G
25
S
E
G
26
S
E
G
27
S
E
G
28
S
E
G
29
S
E
G
30
S
E
G
31
5.4 Display Memory Map (Static Drive)
Figure 16.
Display Control
16.6
Display On/Off
16.6.1
The LCD display state is controlled using DSPC[1:0]/LCD_DCTL register.
6.1.1 LCD Display Control
Table 16.
DSPC[1:0]
lCD display
0x3
All off (static)
0x2
All on (dynamic)
0x1
Normal display
0x0
Display off
(Default: 0x0)
For normal display, set DSPC[1:0] to 0x1. Note that the clock must be supplied. (See Section 16.3.)
If “Display off” is selected, the drive voltage supplied from the LCD power supply circuit stops, and the V
C1
to V
C3
pins are all set to V
SS
level.
Since “All on” and “All off” directly control the driving waveform output by the LCD driver, display memory data
is not altered. COM pins are set to dynamic drive for “All on” and to static drive for “All off.” This function can be
used to make the display flash on and off without altering the display memory.
DSPC[1:0] is reset to 0x0 (Display off) after an initial reset.
DSPC[1:0] is also reset to 0x0 when the
slp
instruction is executed and it reverts to the previous setting after
SLEEP mode is canceled.
inverted Display
16.6.2
The LCD display can be inverted (black/white inversion) using merely control bit manipulation, without changing
the display memory. Setting DSPREV/LCD_DCTL register to 0 inverts the display; setting to 1 returns the display
to normal status.
Note that the display will not be inverted if “All off” is selected using DSPC[1:0]. The display will be inverted
when “All on” is selected.