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Setting the Digitizer
Configuration
The digitizer configuration covered in this section includes:
• setting the arm sources
• setting the arm count
• setting the arm delay
• setting the reference source
• setting the trigger source
• sending arm immediate
• sending trigger immediate
• aborting measurements
Note The trigger count (pre-arm and post-arm reading counts) and the sample
rate are set when the timebase processor is initialized. See "Initializing the
Timebase Processor" in the section "Re-initiating the Digitizer" for more
information.
Setting the Arm
Sources
The registers used to set the arm sources are listed below.
• Arm Source register
base + 49
16
• Arm Control register
base + 4B
16
(used when changing arm source while initiated)
Procedure The arm source can be set/changed when the digitizer is in the idle state or
while it is initiated.
1. Setting/changing the arm source in the idle state:
A. Write the decimal equivalent bit pattern to the arm source
register (base + 49
16
).
2. Setting/changing the arm source while initiated:
A. Suspend the arm trigger by setting bit 2 of the arm control
register (base + 4B
16
) to ’1’ . Retain the settings of the other
register bits.
B. Write the decimal equivalent bit pattern for the desired arm
source to the arm source register (base + 49
16
).
C. Enable the arm trigger by setting bit 2 of the arm control register
(base + 4B
16
) to ’0’ . Retain the settings of the other register bits.
Appendix C Register Programming 373