Section 18 I/O Ports; Overview; Features - Hitachi SH7750 Hardware Manual

18.1

Overview

The SH7750 Series has a 20-bit general-purpose I/O port, SCI I/O port, and SCIF I/O port.
18.1.1

Features

The features of the general-purpose I/O port are as follows:
• 20-bit I/O port with input/output direction independently specifiable for each bit
• Pull-up can be specified independently for each bit.
• Interrupt input is possible for 16 of the 20 I/O port bits.
• Use or non-use of the I/O port can be selected with the PORTEN bit in bus control register 2
(BCR2).
The features of the SCI I/O port are as follows:
• Data can be output when the I/O port is designated for output and SCI enabling has not been
set. This allows break function transmission.
• The RxD pin value can be read at all times, allowing break state detection.
• SCK pin control is possible when the I/O port is designated for output and SCI enabling has
not been set.
• The SCK pin value can be read at all times.
The features of the SCIF I/O port are as follows:
• Data can be output when the I/O port is designated for output and SCIF enabling has not been
set. This allows break function transmission.
• The RxD2 pin value can be read at all times, allowing break state detection.
• CTS2 and RTS2 pin control is possible when the I/O port is designated for output and SCIF
enabling has not been set.
• The CTS2 and RTS2 pin values can be read at all times.

Section 18 I/O Ports

Rev. 6.0, 07/02, page 731 of 986