# Handling interrupts (IRQ/XIRQ) - MC68HC

#### Microcontroller_fan

##### New Member
Previously i was created a different thread but it was not related to IRQ itself (i solved it by using a simple loop)
This is the hardest "suggested" exercise shown in this chapter (interrups for the 68hc11); i need a 68HC11 hero over here; i want to solve it from the beggining til the end; i tried so many times but i failed, this is a hard topic to me (i cannot move to the next section without understanding and solving this one,do you get me?)

It goes like this:

Who can help me with some assembly code?

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#### atferrari

##### Well-Known Member
What is the actual meaning of "a pulse in one bit of memory location XXX must be generated"?

#### Microcontroller_fan

##### New Member
What is the actual meaning of "a pulse in one bit of memory location XXX must be generated"?

#### atferrari

##### Well-Known Member
Oh, no.. it is not related to a "pulse clock" or something like that; in this particular example it means the "action". The mechanical seal will drop a soda and then, a "change" (action) has to be done in the memory location \$0080. Is it clear for you?
Asserting a bit in memory is not a pulse.