What does decfsz delay_reg1,1,1 do?

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spinnaker

Joined Oct 29, 2009
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What does decfsz delay_reg1,1,1 do? I understand it decrements the file register delay_reg1 by the count (1) following the file register name. But what does the second 1 do?

All the documentation I have found only lists decfsz f,d.
 
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