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GMS81C5108
JUNE 2001 Ver 1.0
73
19.3 LCD Display Memory
Display data are stored to the display data area (page 1) in
the data memory.
The display data stored to the display data area (address
0100
H
-0124
H
) are read automatically and sent to the LCD
driver by the hardware. The LCD driver generates the seg-
ment signals and common signals in accordance with the
display data and drive method. Therefore, display patterns
can be changed by only overwriting the contents of the dis-
play data area with a program. The table look up instruc-
tion is mainly used for this overwriting.
Figure 19.3 shows the correspondence between the display
data area and the SEG/COM pins. The LCD lights when
the display data is “1” and turn off when “0”.
LCD display memory in this location that are not used for
LCD display can be allocated for general purpose use.
The SEG data for display is controlled by RPR (RAM Pag-
ing Register).
Figure 19-4 Setting of RAM Paging Register
Figure 19-5 LCD Display Memory
RPR (RAM Paging Register)
ADDRESS : 0F3
H
RESET VALUE : ------00
B
-
Bit : 7 6 5 4 3 2 1 0
R/W
R/W
R/W
R/W
-
-
RPR1
RPR0
-
-
RPR0
RAM Page Instruction
RPR1
x
0 Page
CLRG
x
0
0 Page
SETG
0
1
1 Page
SETG
0
-
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
COM
0
COM
1
COM
2
COM
3
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
0
1
2
3
4
5
6
7
Bit
0100
H
0101
H
0102
H
0103
H
0104
H
0105
H
0106
H
0107
H
0108
H
0109
H
010A
H
010B
H
010C
H
010D
H
010E
H
010F
H
0110
H
0111
H
0112
H
0113
H
0114
H
0115
H
0116
H
0117
H
0118
H
0119
H
011A
H
011B
H
011C
H
011D
H
011E
H
011F
H
0120
H
0121
H
0122
H
0123
H
0124
H
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