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Section 8 I/O Ports
• P84/ExIRQ12/SCK3
The pin function is switched as shown below according to the combination of the C/A bit in
SMR of SCI_3, the CKE1 and CKE0 bits in SCR, and the P84DDR bit.
When the ISS12 bit in ISSR16 is set to 1, this pin can be used as the ExIRQ12 input pin. To
use this pin as the ExIRQ12 input pin, clear the P84DDR bit to 0.
CKE1
C/A
CKE0
P84DDR
Pin function
P84 input pin
ExIRQ12 input pin
[Legend] X: Don't care.
• P83/SDA1
The pin function is switched as shown below according to the combination of the ICE bit in
ICCR of IIC_1 and the P83DDR bit.
When this pin is used as the P83 output pin, the output format is NMOS push-pull output. The
output format for SDA1 is NMOS open-drain output, which allows direct bus drive.
ICE
P83DDR
Pin function
[Legend] X: Don't care.
Rev. 1.00 Mar. 12, 2008 Page 232 of 1178
REJ09B0403-0100
0
0
0
1
P84 output
pin
0
0
P83 input pin
0
1
X
SCK3 output
SCK3 output
pin
1
P83 output pin
1
1
X
X
X
X
X
SCK3 input
pin
pin
1
X
SDA1 input/output pin
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