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Chapter 30 I/O Ports
3.Port Register Settings
■ P23: The functions of Port 23 are controlled by PFR23
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:
Addr 7 6 5 4 3 2 1 0 initial
PFR23 0D97h PFR23.7 PFR23.6 PFR23.5 PFR23.4 PFR23.3 PFR23.2 PFR23.1 PFR23.0 0000 0000
EPFR23 0DD7h - - - - - - - - ---- ----
R/W R/W R/W R/W R/W R/W R/W R/W