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Renesas PROM Programming Adapter PCA7447FP Informations techniques Page 35

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32
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C8 Group
Common Pin and Duty Ratio Control
The common pins (COM0–COM31) to be used are determined by
duty ratio.
Select duty ratio by the duty ratio selection bit (bit 0 of the LCD mode
register).
Table 9 Duty ratio control and common pins used
Duty
ratio
Common pins used
Note: The SEG0/COM16–SEG7/COM23 pins are used as the SEG0–SEG7.
The SEG
67/COM24–SEG60/COM31 pins are used as the SEG67–SEG60.
COM0–COM15 (Note)
Duty ratio
selection bit
16
32
0
1 COM0–COM31
Fig. 30 LCD display RAM map
(frequency of count source for LCDCK)
(divider division ratio for LCD)
f(LCDCK)
(duty ratio)
LCD Display RAM
When LCD display RAM address selection bit is “0”, the area of ad-
dresses 034016 to 042F16 is the designated RAM for the LCD dis-
play. When the bit is “1”, the area of addresses 0040
16 to 012F16 is
the designated RAM for it. When “1”s are written to these addresses,
the corresponding segments of the LCD display panel are turned on.
LCD Drive Timing
The LCDCK timing frequency (LCD drive timing) is generated inter-
nally and the frame frequency can be determined with the following
equation;
f(LCDCK) =
Frame frequency =
S
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3
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9
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1
0
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1
1
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1
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1
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1
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1
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1
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1
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1
8
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1
9
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0
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G
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1
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G
2
2
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G
2
3
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G
4
4
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G
4
5
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E
G
4
6
S
E
G
4
7
S
E
G
4
8
S
E
G
4
9
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E
G
5
0
S
E
G
5
1
S
E
G
5
2
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G
5
3
S
E
G
5
4
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E
G
5
5
S
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G
5
6
S
E
G
5
7
S
E
G
5
8
S
E
G
5
9
S
E
G
6
0
S
E
G
6
1
S
E
G
6
2
S
E
G
6
3
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6
7
000000001000101110111110 001110010001011100000000L
S
B
000000001101100100001000 01000 010001001000000000
000000001010100100001000 010000010001001000000000
000000001000100100001000 001110011111001000000000
000000001000100100001000 000001010001001000000000
000000001000100100001000 010001010001001000000000
000000001000101110001000 001110010001011100000000
000000000000000000000000 000000000000000000000000MSB
010001011111001110001110 111110111110111110111100L
S
B
011011000010010001010001 100000100000100000100010
010101000100010001010000 100000100000100000100010
010001000010001110010000 111100111100111100111100
010001000001010001010000 100000100000100000100000
010001010001010001010001 100000100000100000100000
010001001110001110001110 111110100000100000100000
000000000000000000000000 000000000000000000000000M
S
B
0010001011111001 1001000101111100LSB
0011011000010010 0101101101000000
0010101000100010 0101010101000000
0010001000010001 1101000101111000
0010001000001010 0101000101000000
0010001010001010 0101000101000000
0010001001110001 001000101000000
C
O
M
0
C
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M
1
COM2
C
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M
3
C
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M
4
COM5
C
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M
6
COM7
COM17
C
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M
1
8
C
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M
1
9
C
O
M
2
0
C
O
M
2
1
COM22
C
O
M
2
3
0000000000000000 0000000000000000MSB
0000000000100010 1111101111000000L
S
B
0000000000100010 1000001000100000
0000000000010100 1000001000100000
0000001110001000 1111001111000000
0000000000010100 1000001000000000
0000000000100010 1000001000000000
0000000000100010 1000001000000000
COM8
C
O
M
9
COM10
C
O
M
1
1
COM12
C
O
M
1
3
COM14
C
O
M
1
5
COM24
C
O
M
2
5
COM26
C
O
M
2
7
COM28
C
O
M
2
9
COM30
C
O
M
3
1 0000000000000000 0000000000000000M
S
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COM16
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