S1C63454 TECHNICAL MANUAL
EPSON
47
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
4.7.7 I/O memory of LCD driver
Table 4.7.7.1 shows the I/O addresses and the control bits for the LCD driver. Figure 4.7.7.1 shows the
display memory map.
Table 4.7.7.1 LCD driver control bits
Address
Comment
D3
D2
Register
D1
D0
Name
Init
∗
1
1
0
FF60H
LDUTY1 LDUTY0 VCCHG LPWR
R/W
LDUTY1
LDUTY0
VCCHG
LPWR
0
0
0
0
V
C2
On
V
C1
Off
LCD drive duty
switch
LCD regulated voltage switch
LCD power On/Off
0
1/17
1
1/16
2, 3
1/8
[LDUTY1, 0]
Duty
0
Light
–
–
15
Dark
[LC3–0]
Contrast
FF61H
EXLCDC ALOFF
ALON
LPAGE
R/W
EXLCDC
ALOFF
ALON
LPAGE
0
1
0
0
All Off
All On
F100-F14F
Normal
Normal
F000-F04F
General-purpose register
LCD all OFF control
LCD all ON control
Display memory area selection (when 1/8 duty is selected)
functions as a general-purpose register when 1/16, 1/17 duty is selected
FF62H
LC3
LC2
LC1
LC0
R/W
LC3
LC2
LC1
LC0
–
∗
2
–
∗
2
–
∗
2
–
∗
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
:
F04DH
F04EH
F04FH
F050H
:
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
SEG0
SEG1
SEG1
SEG2
SEG38
SEG39
SEG39
Not-
implemented
COM0–COM7
F100H
F101H
F102H
F103H
F104H
:
F14DH
F14EH
F14FH
F150H
:
F1FFH
D3
COM11
COM15
COM11
COM15
COM11
COM15
COM11
COM15
D2
COM10
COM14
COM10
COM14
COM10
COM14
COM10
COM14
0
Unused area
Always "0"
No Operation
Reading:
Writing:
D1
COM09
COM13
COM09
COM13
COM09
COM13
COM09
COM13
D0
COM8
COM12
COM8
COM12
COM8
COM12
COM8
COM12
SEG0
SEG0
SEG1
SEG1
SEG2
SEG38
SEG39
SEG39
Not-
implemented
COM8–COM15
F200H
F201H
F202H
F203H
:
F24CH
F24DH
F24EH
F24FH
D3
0
0
0
0
D2
0
0
0
0
D1
0
0
0
0
D0
COM16
COM16
COM16
COM16
SEG0
SEG1
SEG38
SEG39
COM16
Non-implementation area Read/write disabled
Fig. 4.7.7.1 Display memory map
LPWR: LCD power control (ON/OFF) register (FF60H•D0)
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 V
SS
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".
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