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

Mb90470 series 16-bit microcontroller

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CHAPTER 20 EXPANDED I/O SERIAL INTERFACE

20.1 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.

I 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 clock.

External shift clock mode: This mode transfers data by synchronization with a clock that is

supplied via an external pin (SCK). Data can also be transferred in this mode by using a

general-purpose port that shares the external pin (SCK).

I Block diagram of expanded I/O serial interface

Figure 20.1-1 "Block diagram of expanded I/O serial interface" shows a block diagram of the

expanded I/O serial interface.

Figure 20.1-1 Block diagram of expanded I/O serial interface

(MSB First) D0 to D7

Internal clock

SMD2 SMD1 SMD0

Internal data bus

SDR (Serial data register)

Control circuit

Internal data bus

D7 to D0 (LSB First)

Select transfer direction

Shift clock counter

STRT MODE BDS SOE

Initial value