Problem Resolution:
Hi,
You can use MPLAB SM tool to simulate interrupt-on-change function on PORTB.
The user, in the interrupt service routine can clear the interrupt in the following manner:
a) Any read or write of PORTB. This will end the mismatch condition.
b) Clear flag bit RBIF.
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这是官方的回答，看来确实是没有读的问题：
Problem Resolution:
Hi,
You can use MPLAB SM tool to simulate interrupt-on-change function on PORTB.
The user, in the interrupt service routine can clear the interrupt in the following manner:
a) Any read or write of PORTB. This will end the mismatch condition.
b) Clear flag bit RBIF.
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