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Section 8 I/O Ports
• P56/EXCL/φ
The pin function is switched as shown below according to the combination of the EXCLE bit
in LPWRCR and the P56DDR bit.
P56DDR
EXCLE
Pin function
[Legend] X: Don't care.
• P55/IRQ13/SSI
The pin function is switched as shown below according to the RE bit in SSER of the SSU and
the P55DDR bit. When the ISS13 bit in ISSR16 is cleared to 0 and the IRQ13E bit in IER16 of
the interrupt controller is set to 1, this pin can be used as the IRQ13 input pin. To use as the
IRQ13 input pin, clear the P55DDR bit to 0.
RE
P55DDR
Pin function
[Legend] X: Don't care.
• P54/IRQ12/SSO
The pin function is switched as shown below according to the TE bit in SSER of the SSU and
the P54DDR bit. When the ISS12 bit in ISSR16 is cleared to 0 and the IRQ12E bit in IER16 of
the interrupt controller is set to 1, this pin can be used as the IRQ12 input pin. To use as the
IRQ12 input pin, clear the P54DDR bit to 0.
TE
P54DDR
Pin function
[Legend] X: Don't care.
Rev. 1.00 Mar. 12, 2008 Page 216 of 1178
REJ09B0403-0100
0
0
P56 input pin
0
0
P55 input pin
IRQ13 input pin
0
0
P54 input pin
IRQ12 input pin
1
EXCL input pin
1
P55 output pin
1
P54 output pin
1
X
φ output pin
1
X
SSI input pin
1
X
SSO output pin
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