H8SSLASH2214 datasheet(389/936 Pages) RENESAS

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Section 9 I/O Ports

Rev.4.00 Sep. 18, 2008 Page 329 of 872

REJ09B0189-0400

Pin Functions and Selection Method

PB0/A8

The pin function is switched as shown below according to the combination of the

operating mode, PFCR setting, bit PB1DDR.

Operating mode

Modes 4 to 6

AE3 to AE0 in

PFCR

B'0000

Other than B'0000

P30DDR

—

Pin function

PB0 input

PB0 output

A8 output

Operating mode

Mode 7

AE3 to AE0 in

PFCR

—

PB0DDR

Pin function

PB0 input

PB0 output

9.8.4

MOS Input Pull-Up Function

Port B has an on-chip MOS input pull-up function that can be controlled by software. MOS input

pull-up can be specified as on or off for individual bits.

With port input pins, when a PBDDR bit is cleared to 0, 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 previous state is retained after a manual reset and in software standby mode.

Table 9.15 summarizes the MOS input pull-up states.

Table 9.15

MOS Input Pull-Up States (Port B)

Pins

Power-On

Reset

Hardware

Standby

Mode

Manual

Reset

Software

Standby

Mode

In Other

Operations

Address output, port output

OFF

Port input

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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