HD64F2149YV datasheet(248/1075 Pages) RENESAS

248 / 1075 page

Section 8 I/O Ports

Rev. 3.00 Jan 18, 2006 page 220 of 1044

REJ09B0280-0300

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)

Port 3

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

8.4.4

MOS Input Pull-Up Function

Port 3 has a built-in MOS input pull-up function that can be controlled by software. This MOS

input pull-up function can be used in modes 2 and 3 (when EXPE = 0), and can be specified as on

or off on a bit-by-bit basis.

When a P3DDR bit is cleared to 0 in mode 2 or 3 (when EXPE = 0), setting the corresponding

P3PCR bit to 1 turns on the MOS input pull-up for that pin.

The MOS input pull-up function is in the off state after a reset and in hardware standby mode. The

prior state is retained in software standby mode.

Table 8.7 summarizes the MOS input pull-up states.

Table 8.7

MOS Input Pull-Up States (Port 3)

Mode

Reset

Hardware

Standby Mode

Software

Standby Mode

In Other

Operations

1, 2 and 3 (EXPE = 1) Off

Off

2, 3 (EXPE = 0)

Off

On/Off

Legend:

Off:

MOS input pull-up is always off.

On/Off: On when P3DDR = 0 and P3PCR = 1; otherwise off.

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