Procedure 1. Reset and initialize the timebase processor.

A. Write the following data to the registers indicated. Except for the abort and arm immediate register (base +4116), these registers must not be set to any other values; therefore, they are not listed in the "Register Descriptions" section.

write any 8-bit value to base + 4116 write any 8-bit value to base + 5F16 write a value of 1 to base + 6516 write a value of 5 to base + 6716 write a value of 0 to base + 6916 write a value of 0 to base + 6B16 write a value of 0 to base + 7D16 write a value of 0 to base + 7F16

2. Set the Trigger count.

The number of readings the digitizer takes each time it is armed is set with the pre-arm and post-arm reading count registers listed below.

Pre-arm reading count registers base + 7316 and base +7516

Post-arm reading count registers base + 7716 and base + 7B16

When taking (x) pre-arm and (y) post-arm readings, and (x) and (y) are the intended number of each set of readings, the count loaded into the pre-arm reading count registers is x-2. The count loaded into the post-arm reading count registers is y-6. When taking post-arm readings only, the pre-arm

count is 1 and the post-arm count is y-3.

382 Register Programming

Appendix C

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HP E1429A manual Count is 1 and the post-arm count is y-3