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SCT (lpc43xx): Additional interrupt requests for each event....

Question asked by lpcware Employee on Jun 15, 2016
Latest reply on Oct 14, 2016 by Dimitris Sideris
Content originally posted in LPCWare by lpc_guy469 on Thu Mar 13 08:38:29 MST 2014

I am having some difficulty with the LPC43xx SCT IRQ handler. 

The SCT Flag Enable register (address=0x400000F4) contents are being programmed with 0x00000004 (Event 2).   So it is expected that an SCT interrupt request should only occur when Event 2 occurs.  However, the SCT is interrupting the LPC43xx with 2 requests for every one of Event 2.

Also, the interrupt latency is 108ns.  This figure is approximately 19 clock cycles.  Is this behavior considered normal or is there a way to shorten this latency.

Thank you in advance for your assistance.