Are there any examples of how to configure the 6509 for rising edge interrupts using filtering ?
I am inserting a pulse onto the 8th pin of the 12th port.
I have configured the interrupt as defined below.
I can see the pulse coming into the card by periodically reading the 12th port.
But I am not yet able to see any interrupts.
this is how I configure the interrupt:
1) set up rising edge sensitivity configuration register for particular port/bit
2) set up the filter interval register to desired pulse width
3) set up filter enable register for particular port/bit
4) set up the following bits in the master interrupt control register: rising edge int enable, overflow enable, edge int enable, master int enable
Then inside my ISR, I plan on doing the following to see if it was my interrupt that was triggered:
1) read change status register and look for the following bits to be set: riding edge, master interrupt, edge status.
2) check overflow bit to see if I missed one.
Question: Is there any interrupt masking that I must do while reading the interrupt status and processing the bits in the change status reg?
Does the above sequence look OK?
