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5.11 LCD Controller
5.11.1 Configuration of LCD controller
The E0C88832/88862 has a built-in dot matrix LCD
driver. The E0C88832 allows an LCD panel with a
maximum of 1,632 dots (51 segments × 32
commons). In the E0C88862 a maximum of 1,312
dots (41 segments × 32 commons) are permitted.
Figure 5.11.1.1 shows the configuration of the LCD
controller and the drive power supply.
5.11.2 Mask option
The drive duty for the built-in LCD driver can be
selected whether it will be 1/32 and 1/16 software-
switched or fixed at 1/8 by the mask option.
V
C2
V
C1
V
C3
V
C4
V
C5
CA
CB
CC
CD
CE
CF
CG
V
SS
V
C1
V
C2
V
C3
V
C4
V
C5
CA
CB
CC
CD
CE
CF
CG
V
SS
Fig. 5.11.1.1 Configuration of LCD controller and drive power supply
E0C88832/88862 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (LCD Controller)
LCD system
LCD contrast
voltage regulator
adjustment circuit
V
C2
LCD system
voltage booster/
V
reducer
C1
V
V
C3–
C5
DSPAR
Display memory
(a) V
LCD system
LCD contrast
voltage regulator
adjustment circuit
V
C1
LCD system
voltage booster/
V
V
C2–
C5
reducer
Display memory
DSPAR
(b) V
Note: V
standard can be selected only for 1/4 bias drive.
C1
LCD drive duty
1/32 & 1/16 duty
1/8 duty
When "1/32 & 1/16 duty" is selected, the drive
duty can be selected by software. When "0" is
written to the drive duty selection register LDUTY,
1/32 duty is selected and when "1" is written, 1/16
duty is selected.
When "1/8 duty" is selected, the drive duty is fixed
at 1/8 and setting of LDUTY becomes invalid.
When the built-in LCD driver is not used, select the
default setting of "1/32 & 1/16 duty".
LC3
LC2
LC1
LC0
LCDC1
LCDC0
DTFNT
LCD driver
LDUTY
COM0~COM15
COM16~COM31/SEG66~SEG51
SEG0~SEG50
COM0~COM15
COM16~COM31/SEG66~SEG51
SEG0~SEG40
standard
C2
LC3
LC2
LC1
LC0
LCDC1
LCDC0
DTFNT
LCD driver
LDUTY
COM0~COM15
COM16~COM31/SEG66~SEG51
SEG0~SEG50
COM0~COM15
COM16~COM31/SEG66~SEG51
SEG0~SEG40
standard
C1
EPSON
E0C88832
E0C88862
E0C88832
E0C88862
89
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