HD6432138SW datasheet(265/1061 Pages) RENESAS

265 / 1061 page

Section 8 I/O Ports

Rev. 4.00 Jun 06, 2006 page 211 of 1004

REJ09B0301-0400

8.4.3

Pin Functions in Each Mode

Modes 1, 2, and 3 (EXPE = 1): In modes 1, 2, and 3 (when EXPE = 1), port 3 pins automatically

function as data I/O pins. The port 3 pin functions are shown in figure 8.10.

D7 (I/O)

D6 (I/O)

D5 (I/O)

D4 (I/O)

D3 (I/O)

D2 (I/O)

D1 (I/O)

D0 (I/O)

Port 3

Figure 8.10 Port 3 Pin Functions (Modes 1, 2, and 3 (EXPE = 1))

Modes 2 and 3 (EXPE = 0): In modes 2 and 3 (when EXPE = 0), port 3 functions as host

interface data bus I/O pins (HDB7 to HDB0) or as I/O ports. When the HI12E bit is set to 1 in

SYSCR2 and a transition is made to slave mode, port 3 functions as the host interface data bus. In

slave mode, P3DR and P3DDR should be cleared to H'00. When the HI12E bit is cleared to 0, port

3 functions as an I/O port, and input or output can be specified on a bit-by-bit basis. When a bit in

P3DDR is set to 1, the corresponding pin functions as an output port, and when cleared to 0, as an

input port.

The port 3 pin functions are shown in figure 8.11.

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)

Port 3

Figure 8.11 Port 3 Pin Functions (Modes 2 and 3 (EXPE = 0))

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