Filter
Top Products
485
Chapter 30 I/O Ports
3.Port Register Settings
■ P24: The functions of Port 24 are controlled by PFR24
P24[7:0] is input/output for I2C serial communication signals SCL, SDA of channels 2 and 3, and External
Interrupt Triggers INT[7:0]. Otherwise, the port can be used as general purpose port.
PFR24.7 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is SCL3 open drain, and INT7 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 ENIR0.EN7 set to ‘1’.
PFR24.6 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is SDA3 open drain, and INT6 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 ENIR0.EN6 set to ‘1’.
PFR24.5 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is SCL2 open drain, and INT5 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 ENIR0.EN5 set to ‘1’.
PFR24.4 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is SDA2 open drain, and INT4 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 ENIR0.EN4 set to ‘1’.
PFR24.3 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is INT3 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 ENIR0.EN3 set to ‘1’.
PFR24.2 0 - Port is in general purpose port mode.
1 - Port is in resource function mode:
Resource function is INT2 input
Addr 7 6 5 4 3 2 1 0 initial
PFR24 0D98h PFR24.7 PFR24.6 PFR24.5 PFR24.4 PFR24.3 PFR24.2 PFR24.1 PFR24.0 0000 0000
EPFR24 0DD8h - - - - - - - - ---- ----
R/W R/W R/W R/W R/W R/W R/W R/W