Datasheet

Section 9 I/O Ports
Rev.6.00 Mar. 18, 2009 Page 362 of 980
REJ09B0050-0600
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 0 1
C/A 0 1 ⎯
CKE0 0 1 ⎯ ⎯
P85DDR 0 1 ⎯ ⎯ ⎯
Pin function P85 input P85 output SCK3 output SCK3 output SCK3 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 0 1
P83DDR 0 1 ⎯
Pin function P83 input P83 output RxD3 input
• 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 0 1
P81DDR 0 1 —
Pin function P81 input P81 output TxD3 output