m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 136

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

2. APPLICATION
Fig. 2.5.19 Connection diagram [FLD automatic display and Key-scan using digit pin]
Fig. 2.5.20 Timing chart [FLD automatic display and Key-scan using digit pin]
122
(2) FLD automatic display and Key-scan using digit pin
Outline : The pannel with fluorescent display (FLD) is displayed by using FLD automatic display function.
Specifications :
(P3
3819 group
Then the key is read in with using digit output waveforms.
P2
0
P0
P1
SEG
P3
–P3
P0
4
0
2
0
–P2
0
DIG
–P0
–P1
–P3
7
,P0
DIG
DIG
DIG
24
,P0
–SEG
7
11
7
1
7
3
• The automatic display function is used.
• 10 digits and 10 segments are used.
• Toff = 15.27 s, Tdisp = 244.39 s, Tscan = 0 s (at f(X
• The FLD digit interrupt is used.
• The digit pin is used for the Key-scan.
3
4
2
0
(P0
(P0
(P1
(P0
,P0
segment
segment
digit
Key
matrix
3
4
3
33
1
2
)
)
)
)
)
Tdisp
FLD digit interrupt request occurs
SP LP
FLD digit interrupt request occurs
3819 Group USER’S MANUAL
REC
FLD digit interrupt request occurs
LEVEL
Pannel with fluorescent display (FLD)
L
R
SUN MON TUE WED THU FRI SAT
FLD digit interrupt request occurs
Tscan = 0 s
2.5 FLD controller
IN
MITSUBISHI MICROCOMPUTER
) = 4.19 MHz)
AM
PM
3819 Group
CH