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Section 8 I/O Ports
• 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
P53DDR
Pin function
[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
P52DDR
Pin function
[Legend] X: Don't care.
Rev. 1.00 Mar. 12, 2008 Page 300 of 1178
REJ09B0403-0100
0
0
P53 input pin
IRQ11 input pin
0
0
P52 input pin
IRQ10 input pin
1
P53 output pin
1
P52 output pin
1
X
RxD1 input pin
1
X
TxD1 output pin
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