HD6432138SW datasheet(255/1061 Pages) RENESAS

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Section 8 I/O Ports

Rev. 4.00 Jun 06, 2006 page 201 of 1004

REJ09B0301-0400

8.2.4

MOS Input Pull-Up Function

Port 1 has an on-chip 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, and can be specified as on or off on a bit-by-

bit basis.

When a P1DDR bit is cleared to 0 in mode 2 or 3, setting the corresponding P1PCR 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 8.4 summarizes the MOS input pull-up states.

Table 8.4

MOS Input Pull-Up States (Port 1)

Mode

Reset

Hardware

Standby Mode

Software

Standby Mode

In Other

Operations

Off

2, 3

Off

On/Off

Legend:

Off:

MOS input pull-up is always off.

On/Off: On when P1DDR = 0 and P1PCR = 1; otherwise off.

8.3

Port 2

8.3.1

Overview

Port 2 is an 8-bit I/O port. Port 2 pins also function as address bus output pins (A15 to A8), 8-bit

PWM output pins (PW15 to PW8) (H8S/2138 Group only), and the timer connection output pin

(CBLANK) (H8S/2138 Group only). Port 2 functions change according to the operating mode.

Port 2 has an on-chip MOS input pull-up function that can be controlled by software.

Figure 8.5 shows the port 2 pin configuration.

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