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What's the difference between SIENF and IENF

Question asked by Lydia Johnson on Feb 22, 2019
Latest reply on Feb 23, 2019 by Carsten Groen

I have a GPIO interrupt working on an LCP11Uxx. There are two registers SIENF and IENF that seem to do the same thing. They both set a bit in IENF. The datasheet says writing to IENF sets an interrupt, and writing to SIENF just writes to IENF. I tested it in the debugger, and it's true.

If I can write directly to IENF, what is the purpose of SIENF?