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Functional Description
13-3
Serial Peripheral Interface (SPI)
Figure 13−2. SPI Clock/Data Timing
During an SPI transfer, data is simultaneously transmitted and received. A
serial clock line synchronizes shifting and sampling of the information on the
two serial data lines.
A slave-select line allows individual selection of a slave SPI device; slave de-
vices that are not selected do not interfere with SPI bus activities. On a master
SPI device, the select line can optionally be used to indicate a multiple master
bus contention (refer to Figure 13−2).
A section of internal RAM from 80
H
to FF
H
can be used as a FIFO to extend
the buffering for receive and transmit. The size of the FIFO can range in size
from 2 to 128 bytes.