SIC63616-(Rev. 1.0) NO. P73
3240-0412
4.6.6 I/O memory of LCD driver
Table 4.6.6.1 shows the I/O addresses and the control bits for the LCD driver. Figure 4.6.6.1 shows the
display memory map.
Table 4.6.6.1 Control bits of LCD driver
D3
D2
D1
D0
Name Init
∗
1
1
0
Address
Comment
Register
FLCKS1 FLCKS0 VCCKS1 VCCKS0
R/W
FLCKS1
FLCKS0
VCCKS1
VCCKS0
0
0
0
0
Frame
frequency
selection
VC boost
frequency
selection
FF12H
0
Off
[VCCKS1, 0]
Frequency
1
2 kHz
2, 3
Prohibited
0
32 Hz
1
24 Hz
2
16 Hz
3
8 Hz
[FLCKS1, 0]
Frequency
FF52H
LC3
LC2
LC1
LC0
R/W
LC3
LC2
LC1
LC0
0
0
0
0
0
Light
—
—
15
Dark
[LC3—0]
Contrast
LCD contrast adjustment
0
Normal
1
Reverse
2
All lit
3
All off
[DSPC1, 0]
Display mode
General
LPAGE
DSPC1
DSPC0
0
0
0
0
1
F200-F36F
0
F000-F16F
General-purpose register
Display memory area (when 1/16 duty is selected)
functions as a general-purpose register when 1/24 or 1/32 is selected
LCD display
mode selection
R/W
FF50H
General LPAGE DSPC1 DSPC0
0
1/32 (32 Hz)
[LDUTY2—0]
Duty
1
Prohibited
2
1/24 (42 Hz)
3
1/24 (21 Hz)
[LDUTY2—0]
Duty
4
1/16 (32 Hz)
5—7
Prohibited
FF51H
General LDUTY2 LDUTY1 LDUTY0
R/W
General
LDUTY2
LDUTY1
LDUTY0
0
0
0
0
1
0
General-purpose register
LCD
drive duty
selection
FF03H
VCHLMOD VDHLMOD General LPWR
R/W
VCHLMOD
VDHLMOD
General
LPWR
0
0
0
0
On
On
1
On
Off
Off
0
Off
Heavy load protection mode On/Off for LCD system voltage regulator
Heavy load protection mode On/Off for internal voltage regulator
General-purpose register
LCD system voltage regulator On/Off
FF02H
VDSEL VCSEL HLON
DBON
R/W
VDSEL
VCSEL
HLON
DBON
0
0
0
0
1
V
D2
On
On
0
V
DD
Off
Off
General-purpose register
Power source select for LCD system voltage regulator
Power voltage booster/halver halving mode On/Off
Power voltage booster/halver boost mode On/Off
*1 Initial value at initial reset
*2 Not set in the circuit
*3 Constantly "0" when being read