m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 137

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

2. APPLICATION
Fig. 2.5.21 Setting of related registers (1) [FLD automatic display and Key-scan using digit pin]
P0SDR
P2DPR
P8SPR
FLDM1
FLDM2
FLDDP
Port P0 segment/digit switch register (Address:32
Port P8 segment/port switch register (Address:34
Port P2 digit/port switch register (Address:33
FLDC mode register 1 (Address:36
FLDC mode register 2 (Address:37
FLD data pointer (Address:38
0
0
1
0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1 0 0 1
0
0
0 1
0
0 0
0
0
3819 Group USER’S MANUAL
0
0
0
0
0
1
1
0
16
)
Tscan = 0 s
Toff = 1/16 Tdisp = 15.27 s
Dull the output waveform of the
High-breakdown-voltage port
Automatic display mode
Stop displaying
Tdisp = 244.39 s
Set ports P1
Set ports P2
Set ports P0
Set ports P0
Set ports P8
Set the value of “the number of digits – 1”
16
16
)
)
1
3
1
7
7
–P2
16
and P1
–P0
–P8
and P0
)
0
16
16
2
0
to output-only port
to digit (DIG
to I/O port
)
)
0
0
to digit (DIG
to segment (SEG
2.5 FLD controller
MITSUBISHI MICROCOMPUTER
7
–DIG
9
, DIG
2
)
3819 Group
33
8
)
, SEG
32
)
123