Tektronix 4000 Series, User Manual

Page: 121 / 326

Acquire the Signal
If you select Yes, then 7-bit addresses are
displayed as eight bits, where the eighth bit
(LSB) is the R/~W bit.
10-bit addresses are displayed as 11 bits. The
fi rst two bits are the two MSBs of the address.
The next bit is the R/~W bit. The last eight
bits are the eight LSBs of the address. (In the
physical layer of the I
2
C protocol, 10 bit I
2
C
addresses are preceded by the fi ve bit code,
11110. The oscilloscope never includes these
fi ve bits in address readouts.)
If you select No, then 7-bit addresses are
displayed as seven bits and 10-bit addresses
are displayed as ten bits.
8. If you selected SPI above, push Polarity and
the desired side-bezel menu choice.
Bus
SPI
De fi ne
Inputs
Thresholds Polarity B1 Label
SPI
Bus Display Event Table
You can set the polarity for the SCLK, SS,
MOSI, or MISO signals.
Active High means when a signal is greater
than the threshold value, it is considered active.
Active Low means when the signal is lower
than the threshold value, it is considered active.
Tektronix 4000 Series Oscilloscopes User Manual 103