HD6432142 datasheet(315/1177 Pages) RENESAS

Il numero della parte	HD6432142

Spiegazioni elettronici	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

PDF	1177 Pages

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Section 8 I/O Ports

Rev. 4.00 Sep 27, 2006 page 271 of 1130

REJ09B0327-0400

8.11.4

MOS Input Pull-Up Function

Port A 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 any operating mode, and can be specified as on or off on a

bit-by-bit basis.

When a PADDR bit is cleared to 0, setting the corresponding PAODR bit to 1 turns on the MOS

input pull-up for that pin. The MOS input pull-up for pins PA7 to PA4 is always off when IICS is

set to 1. When the keyboard buffer control pin function is selected for pins PA7 to PA2, 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 8.24 summarizes the MOS input pull-up states.

Table 8.24

MOS Input Pull-Up States (Port A)

Mode

Reset

Hardware

Standby Mode

Software

Standby Mode

In Other

Operations

1, 2, 3

Off

On/Off

Legend:

Off:

MOS input pull-up is always off.

On/Off: On when PADDR = 0 and PAODR = 1; otherwise off.

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