[CPU] push/pull stack

[CPU] push/pull stack
by Zepper on 2011-02-10 (#73797)

- Do you know if the PPU receives a clock OR pending IRQ/NMIs are acknowledged when the CPU push/pull stack?

by Dwedit on 2011-02-10 (#73799)

I'd think the instruction that pulls flags off the stack would act just like the CLI/SEI instruction for the purpose of interrupts.
And isn't NMI edge-triggered anyway?
I'd also think that the PPU and CPU just do their thing regardless of what the other is doing.

Re: [CPU] push/pull stack
by cpow on 2011-02-10 (#73800)

Zepper wrote:
- Do you know if the PPU receives a clock OR pending IRQ/NMIs are acknowledged when the CPU push/pull stack?

Why would you have reason to question whether the PPU gets clocked? Aren't the CPU and PPU clocked independently? I don't know of a hardware gate between the two that would *prevent* the PPU from receiving a clock if the CPU does something.

The pushing/pulling of stack is just like any other memory access...if you run your PPU 3 clocks for every CPU cycle then run it 3 clocks when the CPU accesses the stack. Maybe I'm confusing your question?

Re: [CPU] push/pull stack
by Zepper on 2011-02-10 (#73803)

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Re: [CPU] push/pull stack
by tepples on 2011-02-10 (#73806)

Zepper wrote:
- Sorry, but why would you have reason to be a dick?

Temper, temper. Calling someone a dick is sometimes itself a dick move.

Re: [CPU] push/pull stack
by Zepper on 2011-02-11 (#73862)

EDIT: well, looks like the final word is yes, if that matters.