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SYNCHRONOUS SERIAL I/O (SSIO) PORT
This device has a synchronous serial I/O (SSIO) port that shares pins with port 6. This chapter
describes the SSIO port and explains how to program it. Chapter 6, "I/O Ports," explains how to
configure the port pins for their special functions. Refer to Appendix B for details about the sig-
nals discussed in this chapter.
8.1
SYNCHRONOUS SERIAL I/O (SSIO) PORT FUNCTIONAL OVERVIEW
The synchronous serial I/O (SSIO) port provides for simultaneous, bidirectional communications
between this device and another synchronous serial I/O device. The SSIO port consists of two
identical transceiver channels. A single dedicated baud-rate generator controls the baud rate of
the SSIO port (19.531 kHz to 2.5 MHz at 20 MHz). Figure 8-1 is a block diagram of the SSIO
port showing a master and slave configuration.
SSIO x _BUF
SSIO x _BAUD
Control Logic
SSIO x _CON
Master 8XC196 SSIO
SD x
SD x
SC x
SC x
SSIO x Interrupt
to Interrupt Controller
or PTS
Figure 8-1. SSIO Block Diagram
CHAPTER 8
SSIO x _BUF
SSIO x _BAUD
Control Logic
SSIO x _CON
Slave 8XC196 SSIO
SSIO x Interrupt
to Interrupt Controller
or PTS
A2840-02
8-1
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