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| 型號： | M38274EE-XXXFP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單芯片8位CMOS微機(jī) |
| 文件頁數(shù)： | 38/70頁 |
| 文件大?。?/td> | 1112K |
| 代理商： | M38274EE-XXXFP |
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38
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3827 Group
MITSUBISHI MICROCOMPUTERS
Common Pin and Duty Ratio Control
The common pins (COM
0
–COM
3
) to be used are determined by
duty ratio.
Select duty ratio by the duty ratio selection bits (bits 0 and 1 of the
LCD mode register).
When releasing from reset, the V
CC
(V
L3
) voltage is output from
the common pins.
Table 9 Duty ratio control and common pins used
Duty
ratio
Common pins used
Notes1:
COM
2
and COM
3
are open.
2:
COM
3
is open.
Bit 1
0
1
1
Bit 0
1
0
1
COM
0
, COM
1
(Note 1)
COM
0
–COM
2
(Note 2)
COM
0
–COM
3
Duty ratio selection bit
2
3
4
Segment Signal Output Pin
Segment signal output pins are classified into the segment-only
pins (SEG
0
–SEG
17
), the segment/output port pins (SEG
18
–
SEG
25
), and the segment/I/O port pins (SEG
26
–SEG
39
).
Segment signals are output according to the bit data of the LCD
RAM corresponding to the duty ratio. After reset release, a V
CC
(=V
L3
) voltage is output to the segment-only pins and the seg-
ment/output port pins are pulled up to the V
CC
(=V
L3
) voltage in
the high impedance condition. The segment/I/O port pins are set
to input ports, and V
CC
(=V
L3
) is applied to them by pull-up resis-
tor.
LCD Display RAM
Address 0040
16
to 0053
16
is the designated RAM for the LCD dis-
play. When “1” 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 in-
ternally and the frame frequency can be determined with the
following equation;
f(LCDCK) =
Frame frequency =
Fig. 41 LCD display RAM map
(frequency of count source for LCDCK)
(divider division ratio for LCD)
f(LCDCK)
(duty ratio)
Bit
address
7
6
5
4
3
2
1
0
0040
16
0041
16
0042
16
0043
16
0044
16
0045
16
0046
16
SEG
1
SEG
3
SEG
5
SEG
7
SEG
9
SEG
0
SEG
2
SEG
4
SEG
6
SEG
8
SEG
10
COM
3
COM
2
COM
1
COM
0
SEG
12
SEG
14
SEG
16
SEG
18
SEG
20
SEG
22
SEG
24
SEG
26
SEG
28
SEG
30
SEG
32
SEG
34
SEG
36
SEG
38
SEG
21
SEG
23
SEG
25
SEG
27
SEG
29
SEG
11
SEG
13
SEG
15
SEG
17
SEG
19
SEG
31
SEG
33
SEG
35
SEG
37
SEG
39
0047
16
0048
16
0049
16
004A
16
004B
16
004C
16
004D
16
004E
16
004F
16
0050
16
0051
16
0052
16
0053
16
COM
3
COM
2
COM
1
COM
0
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