Datasheet

Section 8 I/O Ports
Rev. 2.00 Aug. 20, 2008 Page 219 of 1198
REJ09B0403-0200
• P53/IRQ11/RxD1
The pin function is switched as shown below according to the combination of the RE bit in
SCR of SCI_1 and the P53DDR bit.
When the ISS11 bit in ISSR16 is cleared to 0 and the IRQ11E bit in IER16 of the interrupt
controller is set to 1, this pin can be used as the IRQ11 input pin. To use as the IRQ11 input
pin, clear the P53DDR bit to 0.
RE 0 1
P53DDR 0 1 X
P53 input pin Pin function
IRQ11 input pin
P53 output pin RxD1 input pin
[Legend] X: Don't care.
• P52/IRQ10/TxD1
The pin function is switched as shown below according to the combination of the TE bit in
SCR of SCI_1 and the P52DDR bit.
When the ISS10 bit in ISSR16 is cleared to 0 and the IRQ10E bit in IER16 of the interrupt
controller is set to 1, this pin can be used as the IRQ10 input pin. To use as the IRQ10 input
pin, clear the P52DDR bit to 0.
TE 0 1
P52DDR 0 1 X
P52 input pin Pin function
IRQ10 input pin
P52 output pin TxD1 output pin
[Legend] X: Don't care.