8.3 Port 3
8.3.1 Overview
Port 3 is a 8-bit I/O port, configured as shown in figure 8-2.
Figure 8-2 Port 3 Pin Configuration
8.3.2 Register Configuration and Description
Table 8-5 shows the port 3 register configuration.
Table 8-5 Port 3 Registers
Name
Abbrev.
R/W
Initial Value
Address
Port data register 3
PDR3
R/W
H'00
H'FFD6
Port control register 3
PCR3
W
H'00
H'FFE6
Port pull-up control register 3
PUCR3
R/W
H'00
H'FFE1
Port mode register 3
PMR3
R/W
H'04
H'FFCA
P3 /AEVL
P3 /AEVH
P3 /TXD
7
6
5
Port 3
31
P3 /RXD
P3 /SCK
P3 /RESO
4
3
2
31
31
P3 /UD
P3 /PWM
1
0
141