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Chapter 30 I/O Ports
3.Port Register Settings
■ P08: The functions of Port 08 are controlled by PFR08
Addr
PFR08
0D88h
PFR08.7
EPFR08
0DC8h
If the external bus interface is enabled (by mode pins MD[2:0] or mode vector), P08[7:0] is input/output for
external bus control signals RDY, BRQ, BGRNTX, RDX, WRX[3:0]. Otherwise, the port can be used as general
purpose port.
PFR08.7
0 - Port is in general purpose port mode.
1 - Port is in external bus mode (if external bus is enabled otherwise general purpose port):
External bus function is RDY
PFR08.6
0 - Port is in general purpose port mode.
1 - Port is in external bus mode (if external bus is enabled otherwise general purpose port):
External bus function is BRQ
PFR08.5
0 - Port is in general purpose port mode.
1 - Port is in external bus mode (if external bus is enabled otherwise general purpose port):
External bus function is BGRNTX
PFR08.4
0 - Port is in general purpose port mode.
1 - Port is in external bus mode (if external bus is enabled otherwise general purpose port):
External bus function is RDX
PFR08.3
0 - Port is in general purpose port mode.
1 - Port is in external bus mode (if external bus is enabled otherwise general purpose port):
External bus function is WRX3
PFR08.2
0 - Port is in general purpose port mode.
1 - Port is in external bus mode (if external bus is enabled otherwise general purpose port):
External bus function is WRX2
PFR08.1
0 - Port is in general purpose port mode.
1 - Port is in external bus mode (if external bus is enabled otherwise general purpose port):
External bus function is WRX1
PFR08.0
0 - Port is in general purpose port mode.
1 - Port is in external bus mode (if external bus is enabled otherwise general purpose port):
External bus function is WRX0
466
7
6
5
PFR08.6
PFR08.5
-
-
-
R/W
R/W
R/W
4
3
PFR08.4
PFR08.3
PFR08.2
-
-
R/W
R/W
R/W
2
1
0
PFR08.1
PFR08.0
-
-
-
R/W
R/W
initial
1111 1111
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