Details Of Control Registers - Epson S1C88655 Technical Manual

15.6 Details of Control Registers

Table 15.6.1 shows the LCD driver control bits.
Address Bit Name
00FF08 D7 LCLK
CL output control
D6 LFRM FR output control
D5 SEGREV
SEG output assignment control
D4 COMREV COM output assignment control
D3 DSPAR
LCD display data RAM area selection
D2 DSPREV Reverse display control
D1 DSPC1
LCD display control
D0 DSPC0
00FF09 D7 –
D6 LCDON
D5 LBIAS
D4 VCON
D3 VC5ON V
D2 LBON
Supply voltage booster On/Off control
D1 LCDCS1 Display timing generator control
D0 LCDCS0
LCDCS0, LCDCS1: 00FF09H•D0, D1
Controls the display timing generator.
Table 15.6.2 Controlling display timing generator
LCDCS1 LCDCS0
1 1
1 0
0 1
0 0
Setting LCDCS0–LCDCS1 to "00" stops supplying
the clock to the display timing generator, as a result
all the LCD output signals go to a V
source clock is selected, the display timing
generator inputs the clock as the CL signal and
starts generating the frame (FR) signal.
The display timing generator also outputs the
voltage booster clock to generate the LCD drive
voltages. Therefore, be sure to select a source clock
before turning the on-chip power supply circuit
ON.
At initial reset, LCDCS is set to "00" (OFF).
S1C88655 TECHNICAL MANUAL
Table 15.6.1 LCD driver control bits
Function
DSPC1 DSPC0
1 1 All dots on
1 0 All dots off
0 1 Normal display
0 0 Display off
–
LCD driver circuit On/Off control
LCD bias selection
V voltage generator On/Off control
C1–4
voltage generator On/Off control
C5
LCDCS1 LCDCS0
1 1
1 0
0 1
0 0
Source clock (f
LCD
Programmable timer 5
underflow signal
f /2
OSC1
f /1
OSC1
OFF
level. When a
SS
1
On
On
Normal
Normal
Display area 1
Normal
Display
–
On
1/9 bias
On
On
On
Source clock
P timer 5
f /2
OSC1
f /1
OSC1
Off
LCDON: 00FF09H•D6
Turns the LCD driver circuit ON and OFF.
When "1" is written: ON
When "0" is written: OFF
)
Reading:
When LCDON is set to "1", the LCD driver circuit
activates and allows display controls. However, the
LCD drive voltages must be supplied to the LCD
driver circuit before setting LCDON to "1" (see
Chapter 4, "Power Supply").
When LCDON is set to "0", the LCD driver circuit
deactivates and display controls will be ineffective.
At initial reset, LCDON is set to "0" (OFF).
EPSON
15 LCD DRIVER
0 SR R/W
0 R/W
Off
0 R/W
Off
1 R/W
Reverse
1 R/W
Reverse
0 R/W
Display area 0
1 R/W
Reverse
0 R/W
0 R/W
– –
– "0" when being read
0 R/W
Off
1 R/W
1/7 bias
0 R/W
Off
0 R/W
Off
0 R/W
Off
0 R/W
0 R/W
Valid
Comment
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