User manual

Serial Bus Analysis
R&S
®
RTB2000
181User Manual 1333.1611.02 ─ 06
7,01h, Temperature
# A comma must be enclosed in double quotes:
7,01h,"Temperature, Pressure, and Volume"
# A double quote must also be enclosed in double quotes:
7,7Fh,"Highspeed ""Master"" 01"
# Following lines yield the same result:
7d,0x11,Pressure
7h,11h,Pressure
0x7,17d,Pressure
7,17,Pressure
12.2 SPI Bus (Option R&S RTB-K1)
● The SPI Protocol...................................................................................................181
● SPI Configuration..................................................................................................182
● SPI Trigger............................................................................................................ 185
● SPI Decode Results .............................................................................................188
12.2.1 The SPI Protocol
A 4-channel instrument is required for full support of the SPI protocol, or the MSO
option R&S RTB-B1.
The Serial Peripheral Interface SPI is used for communication with slow peripheral
devices, in particular, for transmission of data streams.
Main characteristics of SPI are:
●
Master-slave communication
●
No device addressing; The slave is accessed by a chip select, or slave select line.
●
No acknowledgement mechanism to confirm receipt of data
●
Duplex capability
Most SPI buses have four lines, two data and two control lines:
●
Clock line to all slaves (SCLK)
●
Slave Select or Chip Select line (SS or CS)
●
Master data output, slave data input (MOSI or SDI)
●
Master data input, slave data output (MISO or SDO)
When the master generates a clock and selects a slave device, data may be transfer-
red in either or both directions simultaneously.
SPI Bus (Option R&S
RTB-K1)