HD64F2149YV datasheet(293/1075 Pages) RENESAS

293 / 1075 page

Section 8 I/O Ports

Rev. 3.00 Jan 18, 2006 page 265 of 1044

REJ09B0280-0300

8.12.4

MOS Input Pull-Up Function

Port B 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 1 to 3 (EXPE = 1) with the ABW bit in WSCR set to

1, and in modes 2 and 3 (EXPE = 0), and can be specified as on or off on a bit-by-bit basis.

When a PBDDR bit is cleared to 0, setting the corresponding PBODR bit to 1 turns on the MOS

input pull-up for that pin. When a pin is designated as an on-chip supporting module output pin,

the MOS input pull-up is always off.

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 8.25 summarizes the MOS input pull-up states.

Table 8.25

MOS Input Pull-Up States (Port B)

Mode

Reset

Hardware

Standby Mode

Software

Standby Mode

In Other

Operations

1, 2, 3 (EXPE = 1) with

ABW in WSCR = 0

Off

1, 2, 3 (EXPE = 1) with

ABW in WSCR = 1, and

2, 3 (EXPE = 0)

Off

On/Off

Legend:

Off:

MOS input pull-up is always off.

On/Off: On when PBDDR = 0 and PBODR = 1; otherwise off.

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