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9.6.4
Pin Functions
Port 8 pins also function as interrupt inputs and SCI_3 I/Os. The correspondence between the
register specification and the pin functions is shown below.
•
P85/SCK3
The pin function is switched as shown below according to the combination of bit C/A in SMR in
SCI_3, bits CKE0 and CKE1 in SCR, and bit P85DDR.
CKE1
C/A
CKE0
P85DDR
Pin function
P85 input
•
P83/RxD3
The pin function is switched as shown below according to the combination of bit RE in SCR of
SCI_3, and bit P83DDR.
RE
P83DDR
Pin function
•
P81/TxD3
The pin function is switched as shown below according to the combination of bit TE in SCR of
SCI_3, and bit P81DDR.
TE
P81DDR
Pin function
Rev. 2.00, 05/03, page 338 of 820
0
0
0
1
P85 output
0
P83 input
0
P81 input
0
1
SCK3 output
0
1
P83 output
0
1
P81 output
1
SCK3 output
SCK3 input
1
RxD3 input
1
—
TxD3 output
1
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