一.PORTx_PCRn 的ISF标志Interrupt Status Flag
The pin interrupt configuration is valid in all digital pin muxing modes.
0 Configured interrupt has not been detected.
1 Configured interrupt has been detected. If pin is configured to generate a DMA request then the
corresponding flag will be cleared automatically at the completion of the requested DMA transfer,
otherwise the flag remains set until a logic one is written to that flag. If configured for a level sensitive
interrupt that remains asserted then flag will set again immediately.
二. PORTx_ISFR, 31-0Interrupt Status Flag
Each bit in the field indicates the detection of the configured interrupt of the same number as the bit.
0 Configured interrupt has not been detected.
1 Configured interrupt has been detected. If pin is configured to generate a DMA request then the
corresponding flag will be cleared automatically at the completion of the requested DMA transfer,
otherwise the flag remains set until a logic one is written to the flag. If configured for a level sensitive
interrupt and the pin remains asserted then the flag will set again immediately after it is cleared.
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