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PicoScope 6 User's Guide 183
Copyright © 2007-2013 Pico Technology Ltd. All rights reserved. psw.en r32
9.6.5
SPI protocol
You can decode SPI Bus data using the serial decoding feature built into PicoScope.
About SPI Bus
SPI (Serial Peripheral Interface) Bus is a serial data standard used for communication
between microprocessors and peripheral devices. It was developed by Motorola. The
original standard uses a 4-wire link, although 3-wire and 2-wire versions are also
used.
The in-window view of the data looks like this:
The columns in the data table are as follows:
Column
Description
No.
Serial number of the packet (decimal). If Accumulate mode is
off, this counts from the start of the selected waveform. If
Accumulate mode is on, this counts from the start of the first
waveform in the waveform buffer.
Packet
Packet type: Start, Stop, Address, Data or Unknown.
Data bytes
Contents of data packets.
Start Time
Time according to PicoScope timebase at start of frame.
End Time
Time according to PicoScope timebase at end of frame.
Packet Time*
The duration of the packet (End Time – Start Time).
Min Voltage*
Minimum voltage.
Max Voltage*
Maximum voltage.
Voltage Delta*
Voltage range of the signal (Max Voltage – Min Voltage).
* Display of these items is toggled on and off by the Statistics button.