Acquire the Sign
al
3. Push SCLK to set the edge of the signal to
match the SPI bus being acquired.
SCLK
4. Set the level of the SS, MOSI, and MISO
signals to match the SPI bus.
SS
Active
High
Active Low
Active High m
eans that a signal is considered
active when the signal is greater than the
threshold value.
MOSI
Active
High
Active Low
Active Low me
ans that the signal is
considered active when the signal is lower
than the threshold value.
MISO
Active
High
Active Low
-more-
10f2
5. Use multip
urpose knob a to set the number
of bits of the SPI Word Size.
Word Size
(a) 8 bi ts
6. Push eithe
r side bezel button to set the bit
order of the SPI bus.
Bit Order
MS First
Bit Order
LS First
RS-232 Bus
To acquire data from a RS-232 bus, you need to also set up these items:
1. If you selected RS-232, push Configure and
the desired side-bezel menu choices.
Bus B1
RS-23
2
Define
Inputs
Thresholds
Configure
9600-
8-N
B1 Label
RS-232
Bus
Display
Event
Table
Use the side-bezel menu to configure the
bus. Use Normal polarity for RS-232 signals
and Inverted polarity for RS-422, RS-485,
and UART buses.
66 MDO4000 Series Oscilloscopes User Manual
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