IA88C00
Data Sheet
Microcontroller
As of Production Version -01
Figure 39. Port 4 Open-Drain (P4OD), R247 Bank 0
Bit
7
D7
6
D6
5
D5
4
D4
3
D3
2
D2
1
D1
0
D0
Initial Value
Read/Write
0
?
0
?
0
?
0
?
0
?
0
?
0
?
0
?
The Port 4 Open-Drain register defines the output driver type for Port 4. If a bit of Port 4 has been
configured as an output and the corresponding bit in the Port 4 Open-Drain register is a 1, the Port 4 bit
will have an open-drain output driver. If it is a 0, the Port 4 bit will have a push-pull output driver. If the
bit of Port 4 has been configured as an input, the corresponding bit is the Port 4 Open-Drain register has
no effect.
Figure 40. Port 4 Open-Drain (P4OD), R247 Bank 0
Bit
7
D7
6
D6
5
D5
4
D4
3
D3
2
D2
1
D1
0
D0
Initial Value
Read/Write
0
W/O
0
W/O
0
W/O
0
W/O
0
W/O
0
W/O
0
W/O
0
W/O
The Port 2/3 A Mode, Port 2/3 B Mode, Port 2/3 C Mode and Port 2/3 D Mode registers control the
modes of Ports 2 and 3. A separate 2-bit field for each of the bits of Ports 2 and 3 configures the bit as
input or output. The field also controls whether the bit is enabled as an external interrupt source and
selects the oputpus as open-drain or push-pull.
Figure 41. Port 2/3 A Mode Register, R248 Bank 0
Bit
7
D7
6
D6
5
D5
4
D4
3
D3
2
D2
1
D1
0
D0
Initial Value
Read/Write
0
W/O
0
W/O
0
W/O
0
W/O
0
W/O
0
W/O
0
W/O
0
W/O
The Port 2/3 A Mode, Port 2/3 B Mode, Port 2/3 C Mode and Port 2/3 D Mode registers control the
modes of Ports 2 and 3. A separate 2-bit field for each of the bits of Ports 2 and 3 configures the bit as
input or output. The field also controls whether the bit is enabled as an external interrupt source and
selects the oputpus as open-drain or push-pull.
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