U j^jitl, Toshiba – Toshiba TMP87CP24AF User Manual
Page 93
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TOSHIBA
TMP87CM24A/P24A
(1)
LCD driving methods
As for LCD driving method, 4 types can be selected by DUTY (bit 4 to bit 2 of LCDCR). The driving
method is initialized in the initial program according to the LCD used.
V
l
CD3 —
0
-
- V | —
V
l
CD3 ~
1 1/fp n
r —11—1 n
h I—'
u
U 1_____________ 1
data "1"
data "0"
(a) 1/4 Duty (1/3 Bias)
0
-■
- V
i
—
H
data"1" data "0"
(c) 1/2 Duty (1/3 Bias)
V
lcd
3 -
0
--
1
/fp
u J^JITL
1/fp -
h_______________________________
L
□
- V | —
V
lcd
3 ~
data"1"
data "0" —
(b) 1/3 Duty (1/3 Bias)
1/fp ^1
0
--
-V
l
CD3 ~
I"*----- data "1" ---------- — data "0" -------------- *"l
(d) Static
Note:
fp: Frame frequency V
lcd
3
-
¿CD
drive voltage
Figure 2-45. LCD Drive Waveform (COM - SEG pins)
3
-
24-93
2002
-
10-03