HD64F2149 Datasheet, PDF (241/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

8.4 Port 3
8.4.1 Overview
Port 3 is an 8-bit I/O port. Port 3 pins also have host interface (LPC) input/output (SERIRQ,
LCLK, LRESET, LFRAME, LAD3 to LAD0), host interface (XBS) data bus input/output (HDB7
to HDB0), 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.
Port 3
Port 3 pins
P37/D15/HDB7/SERIRQ
P36/D14/HDB6/LCLK
P35/D13/HDB5/LRESET
P34/D12/HDB4/LFRAME
P33/D11/HDB3/LAD3
P32/D10/HDB2/LAD2
P31/D9/HDB1/LAD1
P30/D8/HDB0/LAD0
Pin functions in modes 1, 2 and 3 (EXPE = 1)
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 2 and 3 (EXPE = 0)
P37 (I/O)/HDB7 (I/O)/SERIRQ (I/O)
P36 (I/O)/HDB6 (I/O)/LCLK (Input)
P35 (I/O)/HDB5 (I/O)/LRESET (Input)
P34 (I/O)/HDB4 (I/O)/LFRAME (Input)
P33 (I/O)/HDB3 (I/O)/LAD3 (I/O)
P32 (I/O)/HDB2 (I/O)/LAD2 (I/O)
P31 (I/O)/HDB1 (I/O)/LAD1 (I/O)
P30 (I/O)/HDB0 (I/O)/LAD0 (I/O)
Figure 8.9 Port 3 Pin Functions
207