Overview Of The Serial I/O Interface (Sio) - Fujitsu FR60 Hardware Manual

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Overview of the Serial I/O Interface (SIO)

The serial I/O interface (SIO) allows selection of the data transfer mode from the LSB-

first and MSB-first modes. The MB91F355A/354A/355A/F356B/F357B have a 3 channel

serial I/O interface.

The MB91F353A/351A/352A/353A have a 2-channel serial I/O interface.

■ Serial I/O Interface Operating Modes

The serial I/O interface can operate in the following two modes:

Internal shift clock mode:

Data is transferred in synchronization with the internal clock.

External shift clock mode:

Data is transferred in synchronization with the clock input from an external pin (SCK). In this mode,

data can be transferred by a CPU instruction through manipulation of the general-purpose port sharing

the external pin (SCK).

■ Serial I/O Interface (SIO) Registers

The serial I/O interface (SIO) registers are shown below.

Address : 000024

Address : 000025

Address : 000026

Address : 000027

Address : 000032

Address : 000039

STRT Serial mode control sta-

tus register

TST0 SIO test register (SES)

Serial data register

DIV0 SIO prescaler control

DMAC interrupt source

clear register

Mb91350a series