HD6432351 datasheet(414/1025 Pages) RENESAS

414 / 1025 page

Section 9 I/O Ports

Rev. 3.00 Sep 15, 2006 page 380 of 988

REJ09B0330-0300

PB7

PB6

PB5

PB4

PB3

PB2

PB1

PB0

Port B

(I/O)

Figure 9.14 Port B Pin Functions (Modes 3 and 7)

9.9.4

MOS Input Pull-Up Function [H8S/2351 Only]

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 2, 3, 6, and 7, and can be specified as on or off on an

individual bit basis.

When a PBDDR bit is cleared to 0 in mode 2, 3, 6, or 7, setting the corresponding PBPCR 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 power-on reset, and in hardware standby

mode. The prior state is retained after a manual reset, and in software standby mode.

Table 9.16 summarizes the MOS input pull-up states.

Table 9.16 MOS Input Pull-Up States (Port B)

Modes

Power-On

Reset

Hardware

Standby Mode

Manual

Reset

Software

Standby Mode

In Other

Operations

1, 4, 5

OFF

2, 3, 6, 7

OFF

ON/OFF

Legend:

OFF:

MOS input pull-up is always off.

ON/OFF: On when PBDDR = 0 and PBPCR = 1; otherwise off.

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