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Chapter 30 I/O Ports
3.Port Register Settings
■ P21: The functions of Port 21 are controlled by PFR21 and EPFR21
P21[7:0] is input/output for LIN-UART serial communication signals SCK, SOT, SIN of channels 0 and 1, and
Free Run Timer FRT inputs CK of channels 0 and 1. Otherwise, the port can be used as general purpose port.
PFR21.6 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
EPFR21.6 0 - Resource function is SCK1 input/output
1 - Resource function is CK1 input
PFR21.5 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is SOT1 output
PFR21.4 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is SIN1 input
PFR21.2 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
EPFR21.2 0 - Resource function is SCK0 input/output
1 - Resource function is CK0 input
PFR21.1 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is SOT0 output
PFR21.0 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is SIN0 input
Addr 7 6 5 4 3 2 1 0 initial
PFR21 0D95h - PFR21.6 PFR21.5 PFR21.4 - PFR21.2 PFR21.1 PFR21.0 -000 -000
EPFR21 0DD5h - EPFR21.6 - - - EPFR21.2 - - -0-- -0--
R/W R/W R/W R/W R/W R/W R/W R/W