IA88C00
Data Sheet
Microcontroller
As of Production Version -01
Figure 34. Port 0 Mode Control Register (P0M), R240 Bank 0
Bit
7
D7
6
D6
5
D5
4
D4
3
D3
2
D2
1
D1
0
D0
Initial Value
Read/Write
0
R/W
0
R/W
0
R/W
1
R/W
1
R/W
1
R/W
1
R/W
1
R/W
The Port 0 Mode register programs each bit of Port 0 as an address output (part of an external memory
interface) or as an I/O bit. When a bit of this register is 1, the corresponding bit of Port 0 is defined as an
address output. When 0, the corresponding bit of Port 0 is defined as an I/O bit. D0-D7 - P00-P07 Mode,
0 = I/O, 1 = Address.
Figure 35. Port Mode Register (pm), R241 Bank 0
Bit
7
D7
6
D6
5
D5
4
D4
3
D3
2
D2
1
D1
0
D0
Initial Value
Read/Write
X
?
X
?
1
?
0
?
0
?
0
?
0
?
1
?
The Port Mode register provides some additional mode control for Ports 0 and 1.
D0 - Port 0 Direction - If this bit is a 1, all bits of Port 0 configured as I/O will be inputs. If this bit is a 0,
the I/O lines will be outputs.
D1 - Open-Drain Port 0 - If this bit is a 1, all bits of Port 0 configured as outputs will be open-drain
outputs. If 0, they will be push-pull outputs. This bit has no effect on those bits not configured as outputs.
D2 - Open-Drain Port 1 - If Port 1 is configured as an output port and this bit is a 1, all of the port will
be open-drain outputs. If this bit is a 0, they will be push-pull outputs. This bit has no effect if Port 1 is
not configured as an output port or A/D 0-7.
D3 - Enable /DM - If this bit is a 1, Port 35 is configured as Data Memory output line /DM.
D4-D5 - This field selects the configuration of Port 1 as an output port, input port, or address/data port as
part of the external memory interface.
Figure 36. Handshake 0 Control (H0C), R244 Bank 0
Bit
7
D7
6
D6
5
D5
4
D4
3
D3
2
D2
1
D1
0
D0
Initial Value
Read/Write
X
W/O
X
W/O
X
W/O
X
W/O
X
W/O
0
W/O
X
W/O
0
W/O
This register controls Handshake Channel 0.
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