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Section 8 I/O Ports
• P51/IRQ9/RxDF
The pin function is switched as shown below according to the combination of the
enable/disable setting of the SCIF and the P51DDR bit.
When the ISS9 bit in ISSR16 is cleared to 0 and the IRQ9E bit in IER16 of the interrupt
controller is set to 1, this pin can be used as the IRQ9 input pin. To use as the IRQ9 input pin,
clear the P51DDR bit to 0.
SCIF
P51DDR
Pin function
[Legend] X: Don't care.
• P50/IRQ8/TxDF
The pin function is switched as shown below according to the combination of the
enable/disable setting of the SCIF and the P50DDR bit.
When the ISS8 bit in ISSR16 is cleared to 0 and the IRQ8E bit in IER16 of the interrupt
controller is set to 1, this pin can be used as the IRQ8 input pin. To use as the IRQ8 input pin,
clear the P50DDR bit to 0.
SCIF
P50DDR
Pin function
[Legend] X: Don't care.
Rev. 1.00 Mar. 12, 2008 Page 218 of 1178
REJ09B0403-0100
Disabled
0
P51 input pin
IRQ9 input pin
Disabled
0
P50 input pin
IRQ8 input pin
1
P51 output pin
1
P50 output pin
Enabled
X
RxDF input pin
Enabled
X
TxDF output pin
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