Datasheet

Section 8 I/O Ports
Rev. 3.00 Sep. 28, 2009 Page 175 of 710
REJ09B0384-0300
8.12 Change of Peripheral Function Pins
I/O ports that also function as peripheral modules, such as the external interrupt pins, can be
changed.
I/O ports that also function as the external interrupt pins are changed according to the setting of
ISSR16 and ISSR. I/O ports that also function as the 8-bit timer input pins are changed according
to the setting of PTCNT0. The pin name of the peripheral function is indicated by adding ‘Ex’ at
the head of the original pin name. In each peripheral function description, the original pin name is
used.
8.12.1 IRQ Sense Port Select Register 16 (ISSR16), IRQ Sense Port Select Register (ISSR)
ISSR16 and ISSR select ports that also function as IRQ15 to IRQ0 input pins.
• ISSR16
Bit Bit Name Initial Value R/W Description
15 ISS15 0 R/W 0: P57/IRQ15 is selected
1: P87/ExIRQ15 is selected
14 ISS14 0 R/W 0: P56/IRQ14 is selected
1: P86/ExIRQ14 is selected
13 ISS13 0 R/W P85/ExIRQ13 is always selected
12 ISS12 0 R/W P84/ExIRQ12 is always selected
11 ISS11 0 R/W 0: P53/IRQ11 is selected
1: P83/ExIRQ11 is selected
10 ISS10 0 R/W 0: P52/IRQ10 is selected
1: P82/ExIRQ10 is selected
9 ISS9 0 R/W P81/ExIRQ9 is always selected
8 ISS8 0 R/W P80/ExIRQ8 is always selected