m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 143

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

2. APPLICATION
Fig. 2.5.26 Connection diagram [FLD display by software]
Fig. 2.5.27 Timing chart [FLD display by software]
(3) FLD display by software (example of without using FLD controller)
Fig. 2.5.27 shows a timing chart of FLD display by software, and Fig. 2.5.28 shows an enlarged view of Key-scan
of ports P3
Outline : The FLD display and the key read-in are performed by using timer interrupts.
Specifications :
0
3819 group
to P3
P2
P0
P1
P3
P0
P3
4
P0
2
0
0
–P2
0
7
–P0
–P1
–P3
0
,P0
.
–P3
0
,P0
P0
P0
P0
P1
7
7
3
1
7
7
• The display is controlled by software.
• 10 digits and 10 segments are used.
• The Timer 1 interrupts are used.
• The segment pin is used for Key-scan.
1
2
3
4
3
,
digit
segment
segment
Key
matrix
SP LP
3819 Group USER’S MANUAL
REC
LEVEL
Pannel with fluorescent display (FLD)
L
R
SUN MON TUE WED THU FRI SAT
Key-scan
2.5 FLD controller
MITSUBISHI MICROCOMPUTER
AM
PM
3819 Group
CH
129