148
8.4
Port 3
8.4.1
Overview
Port 3 is an 8-bit I/O port, configured as shown in figure 8-3.
P3
P3
P3 /TXD
7
6
5
Port 3
31
P3 /RXD
P3 /SCK
P3 /RESO
4
3
2
31
31
P3 /UD
P3
1
0
Figure 8-3 Port 3 Pin Configuration
8.4.2
Register Configuration and Description
Table 8-8 shows the port 3 register configuration.
Table 8-8
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
Содержание H8/3935
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