Section 18 I/O Ports
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:
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•
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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:
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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.
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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.
&765 and 5765 pin control is possible when the I/O port is designated for output and SCIF
enabling has not been set.
•
The &765 and 5765 pin values can be read at all times.
Rev. 6.0, 07/02, page 731 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
