Datasheet

Section 9 I/O Ports
Rev. 2.00 Sep. 23, 2005 Page 103 of 444
REJ09B0068-0200
9.2 Port 2
Port 2 is a general I/O port also functioning as SCI3 I/O pins. Each pin of the port 2 is shown in
figure 9.2. The register settings of PMR1and SCI3 have priority for functions of the pins for both
uses.
P24
P23
P22/TXD
P21/RXD
P20/SCK3
Port 2
Figure 9.2 Port 2 Pin Configuration
Port 2 has the following registers.
• Port control register 2 (PCR2)
• Port data register 2 (PDR2)
• Port mode register 3 (PMR3)
9.2.1 Port Control Register 2 (PCR2)
PCR2 selects inputs/outputs in bit units for pins to be used as general I/O ports of port 2.
Bit Bit Name
Initial
Value R/W Description
7 to 5    Reserved
4
3
2
1
0
PCR24
PCR23
PCR22
PCR21
PCR20
0
0
0
0
0
W
W
W
W
W
When each of the port 2 pins P24 to P20 functions as a
general I/O port, setting a PCR2 bit to 1 makes the
corresponding pin an output port, while clearing the bit
to 0 makes the pin an input port.