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After Power on, and after EMI and PERI has been set to 1, why is an FSK ring detect interrupt not generated?

April 26, 2017detect EMI fsk interrupt Peri power ring

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After Power on, and after EMI and PERI has been set to 1, why is an FSK ring detect interrupt not generated?

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Answer All peripheral interrupts have their own interrupt mask bit. The Interrupt Mask bit must be 0 so as to allow the interrupt to function normally. In such situations, in addition to the EMI ([0Bh].0) and EPERI ([1Eh].0) bits being set to 1, the RMSK ([29h].3) also has to be cleared to 0 which will then allow the ring detect interrupt to function normally. The Ring or Line reversal detect explanation in the data sheet should be consulted for more information.