Datasheet

Section 8 I/O Ports
Rev. 6.00 Aug 04, 2006 page 219 of 680
REJ09B0145-0600
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 /AEVL
P3 /AEVH
P3 /TXD
7
6
5
Port 3
Notes: 1. The RESO function is not implemented in the H8/38347 Group and H8/38447 Group.
2. The EXCL function only applies to the H8/38347 Group and H8/38447 Group.
31
P3 /RXD
P3 /SCK
P3 /RESO*
1
4
3
2
31
31
P3 /UD/EXCL*
2
P3 /PWM
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 Abbr. 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 2 PMR2 R/W H'D8* H'FFC9
Port mode register 3 PMR3 R/W H'04 H'FFCA
Note: * H'58 in the H8/38347 Group and H8/38447 Group.