
S1C63406 TECHNICAL MANUAL
EPSON
45
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
4.7.6 I/O memory of LCD driver
Table 4.7.6.1 shows the I/O addresses and the control bits for the LCD driver. Figure 4.7.6.1 shows the
display memory map.
Table 4.7.6.1 LCD driver control bits
Address
Comment
D3
D2
Register
D1
D0
Name
Init 1
10
FF60H
LDUTY1 LDUTY0 VCCHG LPWR
R/W
LDUTY1
LDUTY0
VCCHG
LPWR
0
1
1/8
VC2
On
0
1/9
VC1
Off
General-purpose register
LCD drive duty switch
LCD regulated voltage switch
LCD power On/Off
0
Light
–
15
Dark
[LC3–0]
Contrast
FF61H
EXLCDC ALOFF
ALON
LPAGE
R/W
EXLCDC
ALOFF
ALON
LPAGE
0
1
0
1
All Off
All On
1
0
Normal
0
General-purpose register
LCD all OFF control
LCD all ON control
General-purpose register
FF62H
LC3
LC2
LC1
LC0
R/W
LC3
LC2
LC1
LC0
– 2
LCD contrast adjustment
*1 Initial value at initial reset
*2 Not set in the circuit
*3 Constantly "0" when being read
F000H
F001H
F002H
F003H
F004H
:
F075H
F076H
F077H
F078H
:
F0FFH
D3
COM3
COM7
COM3
COM7
COM3
COM7
COM3
COM7
D2
COM2
COM6
COM2
COM6
COM2
COM6
COM2
COM6
D1
COM1
COM5
COM1
COM5
COM1
COM5
COM1
COM5
D0
COM0
COM4
COM0
COM4
COM0
COM4
COM0
COM4
SEG0
SEG1
SEG2
SEG58
SEG59
Not-
implemented
COM0—COM7
0
Unused area
Always "0"
No Operation
Reading:
Writing:
F100H
F101H
F102H
F103H
:
F174H
F175H
F176H
F177H
D3
0
D2
0
D1
0
D0
COM8
SEG0
SEG1
SEG58
SEG59
COM8
Non-implementation area
Read/write disabled
Fig. 4.7.6.1 Display memory map
LPWR: LCD power control (ON/OFF) register (FF60HD0)
Turns the LCD system voltage circuit ON and OFF.
When "1" is written: ON
When "0" is written: OFF
Reading: Valid
When "1" is written to the LPWR register, the LCD system voltage circuit goes ON and generates the LCD
drive voltage. When "0" is written, all the LCD drive voltages go to VSS level.
It takes about 100 msec for the LCD drive voltage to stabilize after starting up the LCD system voltage
circuit by writing "1" to the LPWR register.
At initial reset, this register is set to "0".