M38197 Mitsubishi, M38197 Datasheet - Page 32

• Manufacturer Part Number: M38197
• Description: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
• Manufacturer: Mitsubishi

FLD CONTROLLER
The 3819 group has fluorescent display (FLD) drive and control
circuits.
The FLD controller consists of the following components:
• 42 pins for segments
• 20 pins for digits
• FLDC mode register 1
• FLDC mode register 2
• FLD data pointer
• FLD data pointer reload register
Fig. KA-1 FLD control circuit block diagram
32
Main
address bus
Local
address bus
Address
decoder
0F80
0F8F
0F90
0F9F
0FA0
0FAF
0FB0
0FBF
0FC0
0FCF
0FD0
0FDF
16
16
16
16
16
16
16
16
16
16
16
16
G1 (SEG PA)
G2 (SEG PA)
G15 (SEG PA)
G16 (SEG PA)
G1 (SEG P8)
G2 (SEG P8)
G15 (SEG P8)
G16 (SEG P8)
G1 (SEG P9)
G2 (SEG P9)
G15 (SEG P9)
G16 (SEG P9)
G1 (SEG P3)
G2 (SEG P3)
G15 (SEG P3)
G16 (SEG P3)
G1 (SEG P0)
G2 (SEG P0)
G15 (SEG P0)
G16 (SEG P0)
G1 (SEG P1)
G2 (SEG P1)
G15 (SEG P1)
G16 (SEG P1)
FLD automatic
display RAM
FLD data pointer
reload register
(address 0038
FLD data pointer
(address 0038
Timing
generator
16
16
)
)
Main
data bus
• Port P0 segment/digit switch register
• Port P2 digit/port switch register
• Port PA segment/port switch register
• Port P8 segment/port switch register
• 96-byte FLD automatic display RAM
The segment pins can be used from 16 up to 42 pins (maximum)
and the digit pins can be used from 6 up to 16 pins (maximum).
The segment and the digit pins can be used up to 52 pins (maxi-
mum) in total.
In the FLD automatic display mode ports P1
pins DIG
Local
data bus
FLDC mode
register 1
(address 0036
10
0032
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
0035
0034
to DIG
S/D
S/D
S/D
S/D
S/D
S/D
S/D
S/D
S/P
S/P
S/P
S/P
S/P
S/P
S/P
S/P
S/P
S/P
S/P
S/P
S/P
S/P
S/P
S/P
16
FLD blanking interrupt
FLD digit interrupt
16
16
0033
P0
P0
P0
P0
P0
P0
P0
P0
15
PA
PA
PA
PA
PA
PA
PA
PA
P8
P8
P8
P8
P8
P8
P8
P8
P9
P9
P9
P9
P9
P9
P9
P9
P3
P3
P3
P3
P3
P3
P3
P3
D/P
D/P
D/P
D/P
16
0
1
2
3
4
5
6
7
16
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
)
0014
0010
0012
0006
automatically.
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
/SEG
S/D
S/D
MITSUBISHI MICROCOMPUTERS
P2
P2
P2
P2
0037
32
33
34
35
36
37
38
39
0
1
2
3
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
0000
0004
0
1
2
3
4
5
6
7
16
16
16
16
/DIG
/DIG
/DIG
/DIG
/DIG
/DIG
/DIG
/DIG
/DIG
/DIG
/DIG
/DIG
P1
P1
P1
P1
P1
P1
P1
P1
16
0
1
2
3
4
5
6
7
8
8
8
8
/SEG
/SEG
/DIG
/DIG
/DIG
/DIG
/DIG
/DIG
16
17
18
19
0
1
2
3
4
5
6
7
16
16
10
11
12
13
14
15
40
41
4
8
0002
/DIG
/DIG
8
9
16
8
3819 Group
2
to P1
7
become digit