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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.
Register
Address
D3
D2
LDUTY1 LDUTY0 VCCHG LPWR
FF60H
R/W
EXLCDC ALOFF
ALON
FF61H
R/W
LC3
LC2
FF62H
R/W
*1 Initial value at initial reset
*2 Not set in the circuit
*3 Constantly "0" when being read
COM0–COM7
D3
D2
D1
F000H
COM3
COM2
COM1
COM0
F001H
COM7
COM6
COM5
COM4
F002H
COM3
COM2
COM1
COM0
F003H
COM7
COM6
COM5
COM4
F004H
COM3
COM2
COM1
COM0
:
F04DH
COM7
COM6
COM5
COM4
F04EH
COM3
COM2
COM1
COM0
F04FH
COM7
COM6
COM5
COM4
F050H
:
F0FFH
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
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".
S1C63454 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (LCD Driver)
Table 4.7.7.1 LCD driver control bits
∗1
D1
D0
Name Init
LDUTY1
0
LDUTY0
0
VCCHG
0
LPWR
0
EXLCDC
0
LPAGE
ALOFF
1
ALON
0
LPAGE
0
∗2
LC3
–
LC1
LC0
∗2
LC2
–
∗2
LC1
–
∗2
LC0
–
COM8–COM15
D0
D3
SEG0
F100H
COM11
COM10
SEG0
F101H
COM15
COM14
SEG1
F102H
COM11
COM10
SEG1
F103H
COM15
COM14
SEG2
F104H
COM11
COM10
:
SEG38
F14DH
COM15
COM14
SEG39
F14EH
COM11
COM10
SEG39
F14FH
COM15
COM14
F150H
Not-
:
implemented
F1FFH
Fig. 4.7.7.1 Display memory map
1
0
LCD drive duty
switch
V
V
LCD regulated voltage switch
C2
C1
On
Off
LCD power On/Off
General-purpose register
All Off
Normal
LCD all OFF control
All On
Normal
LCD all ON control
F100-F14F
F000-F04F
Display memory area selection (when 1/8 duty is selected)
functions as a general-purpose register when 1/16, 1/17 duty is selected
LCD contrast adjustment
[LC3–0]
Contrast
D2
D1
D0
COM09
COM8
SEG0
COM13
COM12
SEG0
COM09
COM8
SEG1
COM13
COM12
SEG1
COM09
COM8
SEG2
COM13
COM12
SEG38
COM09
COM8
SEG39
COM13
COM12
SEG39
Not-
implemented
EPSON
Comment
[LDUTY1, 0]
0
Duty
1/17
0
–
15
Light
–
Dark
COM16
D3
D2
D1
D0
F200H
0
0
0
COM16
F201H
F202H
0
0
0
COM16
F203H
:
F24CH
0
0
0
COM16
F24DH
F24EH
0
0
0
COM16
F24FH
Non-implementation area
0
Unused area
Reading:
Always "0"
Writing:
No Operation
level.
SS
1
2, 3
1/16
1/8
SEG0
SEG1
SEG38
SEG39
Read/write disabled
47
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