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Setting the Trigger
Source
The register used to set the digitizer’s trigger (sample) source is listed below.
• Trigger source register
base + 4D
16
Procedure The trigger source can be set/changed when the digitizer is in the idle state
or while it is initiated.
1. Setting/changing the trigger source while in the idle state:
A. Write the decimal equivalent bit pattern to the trigger source
register while retaining the settings of the other bits
(base + 4D
16
).
2. Setting/changing the trigger source while initiated:
A. Suspend the sample trigger by setting bit 7 of the trigger source
register (base + 4D
16
) to ’1’ . Retain the settings of the other
register bits.
B. Write the decimal equivalent bit pattern for the desired trigger
source to the trigger source register.
C. Enable the sample trigger by setting bit 7 of the trigger control
register (base + 4D
16
) to ’0’ . Retain the settings of the other
register bits.
Sending an Arm
Immediate Signal
An arm immediate signal arms the digitizer, overriding arm source ’hold’
and any programmed arm delay. The registers used to send an arm
immediate signal are listed below.
• Abort and Arm Immediate register
base + 41
16
• Arm Status register
base + 43
16
Procedure 1. Determine the arm state:
A. Read bits 7 and 5 of the arm status register (base + 43
16
). If bit 7
is ’1’, the digitizer is already armed and it is not necessary to send
an arm immediate. If bit 5 is ’1’, arm immediate must not be sent
since the pre-arm reading count has not been reached.
376 Register Programming Appendix C