M38197MA Datasheet, PDF (32/60 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
3819 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
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
• 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 P12 to P17 become digit
pins DIG10 to DIG15 automatically.
Main
address bus
0F8016
FLD automatic
display RAM
G1 (SEG PA)
G2 (SEG PA)
Main
data bus
0F8F16
0F9016
Local
address bus
G15 (SEG PA)
G16 (SEG PA)
G1 (SEG P8)
G2 (SEG P8)
0F9F16
0FA016
G15 (SEG P8)
G16 (SEG P8)
G1 (SEG P9)
G2 (SEG P9)
0FAF16
0FB016
G15 (SEG P9)
G16 (SEG P9)
G1 (SEG P3)
G2 (SEG P3)
0FBF16
0FC016
G15 (SEG P3)
G16 (SEG P3)
G1 (SEG P0)
G2 (SEG P0)
G15 (SEG P0)
0FCF16 G16 (SEG P0)
0FD016 G1 (SEG P1)
G2 (SEG P1)
G15 (SEG P1)
0FDF16 G16 (SEG P1)
FLD data pointer
reload register
(address 003816)
Address
decoder
FLD data pointer
(address 003816)
Timing
generator
Local
data bus
S/P PA0/SEG0
S/P PA1/SEG1
S/P PA2/SEG2
S/P PA3/SEG3 ⁸
S/P PA4/SEG4
S/P PA5/SEG5
S/P PA6/SEG6
S/P PA7/SEG7
003516 001416
S/P P80/SEG8
S/P P81/SEG9
S/P P82/SEG10
S/P P83/SEG11 ⁸
S/P P84/SEG12
S/P P85/SEG13
S/P P86/SEG14
S/P P87/SEG15
003416 001016
P90/SEG16
P91/SEG17
P92/SEG18
P93/SEG19 ⁸
P94/SEG20
P95/SEG21
P96/SEG22
P97/SEG23
001216
P30/SEG24
P31/SEG25
P32/SEG26
P33/SEG27 ⁸
P34/SEG28
P35/SEG29
P36/SEG30
P37/SEG31
000616
S/D P00/SEG32/DIG0
S/D P01/SEG33/DIG1
S/D P02/SEG34/DIG2
S/D P03/SEG35/DIG3
8
S/D P04/SEG36/DIG4
S/D P05/SEG37/DIG5
S/D P06/SEG38/DIG6
S/D P07/SEG39/DIG7
003216
000016
S/D P10/SEG40/DIG8
S/D P11/SEG41/DIG9
P12/DIG10
P13/DIG11
8
P14/DIG12
P15/DIG13
P16/DIG14
P17/DIG15
FLDC mode
register 1
003716 000216
(address 003616)
D/P P20/DIG16
D/P P21/DIG17 ⁴
D/P P22/DIG18
D/P P23/DIG19
003316 000416
FLD blanking interrupt
FLD digit interrupt
Fig. KA-1 FLD control circuit block diagram
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