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what if the same Interrupt comes whihle still executing the Interrupt routeine?

1. what if the same Interrupt comes whihle  still executing the Interrupt routeine? 

as far as i know, then the same Interrupt request will be ignored. 

is it right also for 6678L? 

2. but if a Irq with higher priority comes, i though the cpu will wait until the old one finished then go for the higher priority one. 

is it right also for 6678L?

thanks for your answers!