m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 130

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

2. APPLICATION
Fig. 2.5.13 Enlarged view of SEG
Fig. 2.5.14 Setting of related registers (1) [FLD automatic display and Key-scan using segment pin]
116
After switching a segment pin to an output port, the waveform shown below is created by software, and the Key-scan
is performed.
Figures 2.5.14 and 2.5.15 show a setting of related registers.
FLDM2
FLDM1
FLDDP
SEG
SEG
SEG
SEG
24
25
26
31
(P3
(P3
(P3
(P3
0
1
2
7
)
)
)
)
FLDC mode register 2 (Address:37
FLDC mode register 1 (Address:36
FLD data pointer (Address:38
0
1
0
0
0
0
0
0
0
0
0
0
1 0 0 1
24
0
0
to SEG
0
1
3819 Group USER’S MANUAL
1
1
31
16
during Tscan
)
Automatic display mode
Stop displaying
Tdisp = 244.39 s
Set ports P1
Tscan = 3
Toff = 1/16 Tdisp = 15.27 s
Dull the output waveform of the High-breakdown-voltage port
Set the value of “the number of digits – 1”
16
16
)
)
1
Tdisp = 733.17 s
and P1
0
to digit (DIG
MITSUBISHI MICROCOMPUTER
2.5 FLD controller
9
, DIG
8
)
3819 Group