Datasheet

Section 9 I/O Ports
Rev.5.00 Nov. 02, 2005 Page 116 of 418
REJ09B0028-0500
9.2.3 Pin Functions
The correspondence between the register specification and the port functions is shown below.
P22/TXD pin
Register PMR1 PCR2
Bit Name TXD PCR22 Pin Function
Setting
Value
0 0 P22 input pin
1 P22 output pin
1 X TXD output pin
Legend: X: Don't care.
P21/RXD pin
Register SCR3 PCR2
Bit Name RE PCR21 Pin Function
Setting
Value
0 0 P21 input pin
1 P21 output pin
1 X RXD input pin
Legend: X: Don't care.
P20/SCK3 pin
Register SCR3 SMR PCR2
Bit Name CKE1 CKE0 COM PCR20 Pin Function
Setting Value 0 0 0 0 P20 input pin
1 P20 output pin
0 0 1 X SCK3 output pin
0 1 X X SCK3 output pin
1 X X X SCK3 input pin
Legend: X: Don't care.