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Why, when a low going edge is presented on the external interrupt pin the HT48XA3 MCU does not wake-up?

April 26, 2017external going ht48xa3 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 HT48XA3 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 EIF changes from “0” to “1”. If when the MCU enters a HALT condition the EIF flag is already set to “1”, then a further interrupt will have no effect on the status of the EIF flag, which will remain in its present “1” condition. As a transition a wake-up will not occur.