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CHAPTER 18 EXPANDED I/O SERIAL INTERFACE
18.1 Overview of Expanded I/O Serial Interface
The expanded I/O serial interface is a serial I/O interface with an 8-bit/1-channel
configuration that is used to transfer data by clock synchronization. For data transfer,
LSB first or MSB first can be selected.
■
Overview of expanded I/O serial interface
The expanded I/O serial interface has the following two operation modes:
•
Internal shift clock mode: This mode transfers data by synchronization with the internal
•
External shift clock mode: This mode transfers data by synchronization with a clock that is
386
clock.
supplied via an external pin (SCK). Data can also be transferred
with instruction of CPU in this mode by using a general-purpose
port that shares the external pin (SCK).
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