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18.1
Overview
The SH7751 Series has a 32-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:
Available only in PCI-disabled mode.
32-bit I/O port with input/output direction independently specifiable for each bit.
Pull-up can be specified independently for each bit.
The 32 bits of the general-purpose I/O port are divided into 16-bit port A and 16-bit port B.
Interrupts can be input to 16-bit port A.
Use or non-use of the I/O port can be selected with the PORTEN bit in bus control register 2
(BCR2). (Do not set PORTEN = 1 when in PCI-enabled mode.)
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.
SCK2,
, and
SCIF enabling has not been set.
The SCK2,
Section 18 I/O Ports
pin control is possible when the I/O port is designated for output and
, and
pin values can be read at all times.
Rev. 3.0, 04/02, page 707 of 1064
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