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Why, when a low going edge is presented on the external interrupt pin the MCU does not wake-up?

April 26, 2017external going interrupt low mcu Pin presented wake-up

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Why, when a low going edge is presented on the external interrupt pin the MCU does not wake-up?

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Answer Although the MCU can be woken up by an external interrupt, the actual wake process takes place only when the Interrupt Request Flag EIF0/EIF1 changes from “0” to “1”. If when the MCU enters a HALT condition the EIF0/EIF1 flag is already set to “1”, then a further interrupt will have no effect on the status of the EIF0/EIF1 flag, which will remain in its present “1” condition. As a transition a wake-up will not occur.