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■ P23: The functions of Port 23 are controlled by PFR23
Addr
PFR23
0D97h
PFR23.7
EPFR23
0DD7h
P23[7:0] is input/output for CAN serial communication signals TX, RX of channels 0 to 3, and External Interrupt
Triggers INT[11:8]. Otherwise, the port can be used as general purpose port.
PFR23.7
0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is TX3 output
PFR23.6
0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is RX3 input, and INT11 input
Remark: This pin supports external interrupt wake up from STOP-HIZ mode. Because of this
the internal input line is not forced to low in STOP-HIZ mode if the PFR is set to '1' and
interrupt is enabled with ENIR1.EN11 set to '1'.
PFR23.5
0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is TX2 output
PFR23.4
0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is RX2 input, and INT10 input
Remark: This pin supports external interrupt wake up from STOP-HIZ mode. Because of this
the internal input line is not forced to low in STOP-HIZ mode if the PFR is set to '1' and
interrupt is enabled with ENIR1.EN10 set to '1'.
PFR23.3
0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is TX1 output
PFR23.2
0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is RX1 input, and INT9 input
Remark: This pin supports external interrupt wake up from STOP-HIZ mode. Because of this
the internal input line is not forced to low in STOP-HIZ mode if the PFR is set to '1' and
interrupt is enabled with ENIR1.EN9 set to '1'.
PFR23.1
0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is TX0 output
PFR23.0
0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
7
6
5
PFR23.6
PFR23.5
-
-
-
R/W
R/W
R/W
4
3
PFR23.4
PFR23.3
PFR23.2
-
-
R/W
R/W
R/W
Chapter 30 I/O Ports
3.Port Register Settings
2
1
0
PFR23.1
PFR23.0
-
-
-
R/W
R/W
initial
0000 0000
---- ----
483
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