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2. Send the arm immediate signal.
A. Read the Abort and Arm Immediate register (base + 41
16
).
Reading the registers sends an arm immediate signal.
Sending a Trigger
Immediate Signal
A trigger immediate signal triggers the digitizer, overriding the sample/hold
bit of the trigger source register.’The registers used to send a trigger
immediate signal are:
• Trigger Immediate register
base + 5D
16
• Trigger Source register
base + 4D
16
Procedure 1. Suspend sample triggers (e.g. trigger hold).
A. Set trigger source register (base + 4D
16
) bit 7 to ’1’ to suspend
sample triggers. Be sure retain the settings of bits 6 - 0.
2. Send a trigger immediate signal.
A. Write any 8-bit value to the trigger immediate register
(base + 5D
16
).
3. Re-enable sample triggers.
A. Set bit 7 (base + 4D
16
) to ’0’ to enable sampling for the next
reading (measurement) sequence. Retain the settings of bits
6 - 0.
Aborting
Measurements
The registers used to abort digitizer measurements are shown below. "base"
is the A24 base address.
• Trigger Source register
base + 4D
16
• Abort and Arm Immediate register
base + 41
16
Procedure 1. Suspend sample triggers (e.g. trigger hold).
A. Set trigger source register (base + 4D
16
) bit 7 to ’1’ to suspend
sample triggers. Be sure retain the settings of bits 6 - 0.
Appendix C Register Programming 377