m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 129

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

2. APPLICATION
Fig. 2.5.11 Connection diagram [FLD automatic display and Key-scan using segment pin]
Fig. 2.5.12 Timing chart [FLD automatic display and Key-scan using segment pin]
2.5.2 FLD controller application examples
(1) FLD automatic display and Key-scan using segment pin
Figure 2.5.12 shows a timing chart of the Key-scan using an FLD automatic display and segments, and Figure
2.5.13 shows an enlarged view of SEG
Outline : The pannel with fluorescent display (FLD) is displayed by using FLD automatic display function.
Specifications :
(P3
0
SEG
–P3
DIG
3819 group
7
DIG
DIG
DIG
24
,P0
Then the key is read in with using segment pin by software.
P2
P0
P1
P3
–SEG
P0
11
2
3
4
0
4
2
(P0
(P0
(P0
(P1
,P0
0
0
–P2
–P0
0
–P1
–P3
,P0
33
2
3
4
3
1
7
)
)
)
)
)
7
3
1
7
• The automatic display function is used.
• 10 digits and 10 segments are used.
• Toff = 15.27 s, Tdisp = 244.39 s, Tscan = 733.17 s (at f(X
• The FLD blanking interrupt is used.
• The segment pin is used for the Key-scan.
digit
segment
segment
Tdisp
Key
matrix
SP LP
24
3819 Group USER’S MANUAL
to SEG
REC
LEVEL
Pannel with fluorescent display (FLD)
31
during Tscan.
L
R
FLD blanking interrupt request occurs
SUN MON TUE WED THU FRI SAT
Key-scan
Tscan
2.5 FLD controller
MITSUBISHI MICROCOMPUTER
AM
PM
IN
) = 4.19 MHz)
3819 Group
CH
115