Control Of Lcd Controller - Epson 0C88832 Technical Manual

5.11.7 Control of LCD controller

Table 5.11.7.1 shows the LCD controller control bits.
Address Bit Name
00FF10 D7 –
–
D6 – –
D5 –
–
D4 LCCLK General-purpose register
D3 LCFRM
General-purpose register
D2 DTFNT LCD dot font selection
D1 LDUTY
LCD drive duty selection
D0 SGOUT General-purpose register
00FF11 D7 –
–
D6 DSPAR
LCD display memory area selection
D5 LCDC1
LCD display control
D4 LCDC0
D3 LC3
LCD contrast adjustment
D2 LC2
D1 LC1
D0 LC0
*1 When 1/8 duty has been selected by mask option, setting of this register becomes invalid.
LDUTY: 00FF10H•D1
Selects the drive duty.
When "1" is written: 1/16 duty
When "0" is written: 1/32 duty
Reading:
When "1/32 & 1/16 duty" is selected by the mask
option, select whether the drive duty will be 1/32
or 1/16.
When "0" is written to LDUTY, 1/32 duty is
selected and the combined common/segment
output terminal is switched to the common termi-
nal.
When "1" is written to LDUTY, 1/16 duty is selected
and the combined common/segment output
terminal is switched to the segment terminal.
When "1/8 duty" is selected by the mask option, the
combined common/segment terminals are fixed to
the segment terminals and the setting of LDUTY
becomes invalid.
The correspondence between the display memory
bits set according to the drive duty, and the
common/segment terminals are shown in Figures
5.11.5.1–5.11.5.6.
At initial reset, LDUTY is set to "0" (1/32 duty).
E0C88832/88862 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (LCD Controller)
Table 5.11.7.1 LCD controller control bits
Function
LCDC1 LCDC0 LCD display
1 1 All LCDs lit
1 0 All LCDs out
0 1 Normal display
0 0 Drive off
LC3 LC2 LC1 LC0 Contrast
1 1 1 1
1 1 1 0
: : : :
0 0 0 0
Valid
1
–
–
–
1
5 x 5 dots
1/16 duty
1
–
Display area 1 Display area 0
Dark
:
:
Light
DTFNT: 00FF10H•D2
Selects the dot font.
When "1" is written: 5 × 5 dots
When "0" is written: 5 × 8 dots
Reading:
Select 5 × 8 dots or 5 × 5 dots type for the display
memory area.
When "0" is written to DTFNT, 5 × 8 dots is selected
and when "1" is written, 5 × 5 dots is selected.
The correspondence between the display memory
bits set according to the dot font, and the common/
segment terminals are shown in Figures 5.11.5.1–
5.11.5.6.
At initial reset, DTFNT is set to "0" (5 × 8 dots).
DSPAR: 00FF11H•D6
Selects the display area.
When "1" is written: Display area 1
When "0" is written: Display area 0
Reading:
Selects which display area is secured for two
screens in the display memory, will be displayed
when 1/16 or 1/8 duty is selected.
When "0" is written to DSPAR, display area 0 is
selected and when "1" is written, display area 1 is
selected.
EPSON
0 SR R/W Comment
–
–
Constantry "0" when
–
–
being read
–
–
0 R/W
0 Reserved register
0 R/W
0 R/W
5 x 8 dots
0 R/W
1/32 duty *1
0 R/W
0 Reserved register
–
– "0" when being read
0 R/W
0 R/W
These bits are reset
to (0, 0) when
0 R/W
SLP instruction
is executed.
0 R/W
0 R/W
0 R/W
0 R/W
Valid
Valid
101