m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 131

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

2. APPLICATION
Fig. 2.5.15 Setting of related registers (2) [FLD automatic display and Key-scan using segment pin]
FLDM2
P0SDR
P2DPR
P8SPR
PASPR
ICON2
P2D
IREQ2
Port P0 segment/digit switch register (Address:32
Port P8 segment/port switch register (Address:34
Port PA segment/port switch register (Address:35
Port P2 direction register (Address:05
Interrupt control register 2 (Address:3F
FLDC mode register 2 (Address:37
Port P2 digit/port switch register (Address:33
Interrupt request register 2 (Address:3D
0
0
0
0
0 1
0
0
0 0
0 0
0 0
0
0 0
0
0
0
0
0
0 0
0
0
0
0 0 0 0
0 1
0
0 0 0
0
0
1
3819 Group USER’S MANUAL
0
1
1
Set ports P2
Set ports PA
Set ports P8
Set ports P2
Set the FLD blanking interrupt request bit to “0”.
FLD blanking interrupt : Enabled
Set ports P0
Set ports P0
Start displaying
16
)
16
16
)
16
)
)
3
7
7
7
1
7
–P2
–PA
–P8
–P2
–P0
16
and P0
)
0
0
0
4
2
16
16
to output-only port
to digit (DIG
to I/O port
16
to I/O port
to the input mode
)
)
)
0
to segment (SEG
2.5 FLD controller
7
MITSUBISHI MICROCOMPUTER
–DIG
2
)
33
, SEG
3819 Group
32
)
117