Datasheet

Section 8 I/O Ports
Rev. 4.00 Sep 27, 2006 page 233 of 1130
REJ09B0327-0400
8.4 Port 3
8.4.1 Overview
Port 3 is an 8-bit I/O port. Port 3 pins also function as host data bus I/O pins (HDB7 to HDB0)
(H8S/2148 Group and H8S/2147N only), and as data bus I/O pins. Port 3 functions change
according to the operating mode. Port 3 has a built-in MOS input pull-up function that can be
controlled by software.
Figure 8.9 shows the port 3 pin configuration.
P37/D15/HDB7
P36/D14/HDB6
P35/D13/HDB5
P34/D12/HDB4
P33/D11/HDB3
P32/D10/HDB2
P31/D9/HDB1
P30/D8/HDB0
Port 3
Port 3 pins
D15 (I/O)
D14 (I/O)
D13 (I/O)
D12 (I/O)
D11 (I/O)
D10 (I/O)
D9 (I/O)
D8 (I/O)
Pin functions in modes 1, 2 and 3 (EXPE = 1)
P37 (I/O)/HDB7 (I/O)
P36 (I/O)/HDB6 (I/O)
P35 (I/O)/HDB5 (I/O)
P34 (I/O)/HDB4 (I/O)
P33 (I/O)/HDB3 (I/O)
P32 (I/O)/HDB2 (I/O)
P31 (I/O)/HDB1 (I/O)
P30 (I/O)/HDB0 (I/O)
Pin functions in modes 2 and 3 (EXPE = 0)
Figure 8.9 Port 3 Pin Functions