Overview Of The I/O Extended Serial Interface - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 18 I/O EXTENDED SERIAL INTERFACE

18.1 Overview of the I/O Extended Serial Interface

The I/O extended serial interface is a serial I/O interface having an eight-bit by one
channel configuration, which can transfer data in synchronization with clocks. Also,
the LSB first or MSB first mode can be selected for data transfer.
■ Overview of the I/O Extended Serial Interface
The I/O extended serial interface supports the following two operation modes:
❍ Internal shift clock mode
Transfers data in synchronization with internal clocks (communication prescaler).
❍ External shift clock mode
Transfers data in synchronization with clock input at the external pin (SCK). By manipulating
the general-purpose port, which shares the external pin (SCK) in this mode, a transfer can also
be executed by an instruction from the CPU.
This series incorporates two channels of the I/O extended serial interface.
Note:
While channel 0 of the I/O extended serial interface is used, channel 0 of the I
used because they share the same I/O port.
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C interface cannot be