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→Push/Pull on the Stack
=== Push/Pull on the Stack ===
When a value is pushed to the stack, the stack pointer register (SP) is decremented and the selected register is written to memory location $0100+SP.
When a value is pulled from the stack, the stack pointer register (SP) is incremented and the selected register is loaded from memory location $0100+SP.
There are two instructions to push data onto the stack:
And two matching instructions to pull data from the stack:
Note that some other operations, such as JSR, interrupts, RTI, and RTS, cause data to be pushed to or pulled from the stack.
