Datasheet

Section 9 I/O Ports
Rev. 3.00 Mar. 15, 2006 Page 120 of 526
REJ09B0060-0300
9.3 Port 3
Port 3 is a general I/O port. Each pin of the port 3 is shown in figure 9.3.
P35
P36
P37
P30
P34
P33
P32
P31
Port 3
Figure 9.3 Port 3 Pin Configuration
Port 3 has the following registers.
• Port control register 3 (PCR3)
• Port data register 3 (PDR3)
9.3.1 Port Control Register 3 (PCR3)
PCR3 selects inputs/outputs in bit units for pins to be used as general I/O ports of port 3.
Bit Bit Name
Initial
Value R/W Description
7
6
5
4
3
2
1
0
PCR37
PCR36
PCR35
PCR34
PCR33
PCR32
PCR31
PCR30
0
0
0
0
0
0
0
0
W
W
W
W
W
W
W
W
Setting a PCR3 bit to 1 makes the corresponding pin
an output port, while clearing the bit to 0 makes the pin
an input port.