[PDF] 6502 stack example

For example, on a 6502, if S = $FD, and the program pushes something, it'll be written to $01FD and then S becomes $FC to show that $01FC is available to store the next value. It is common practice on a 6502 to initialize the stack pointer to $FF at reset time.
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  • What is the stack in 6502?

    Unlike its main rival the Z80, the 6502 had a size limit of 256 bytes for the hardware stack. The 6502 stack is mainly meant as a return return stack and for register preservation - which usually isn't a lot on a CPU with just 3 registers.2 jan. 2023

  • How does the 6502 work?

    The 6502 Architecture
    The 6502 is strictly an 8-bit architecture, with a single 8-bit accumulator register, and can access a maximum of 64K bytes of random access memory. Memory addresses are exactly 16 bits in length, because 216 = 65536 = 64K. Valid addresses range from 0 up to 65535.

  • How does a CPU stack work?

    The data to be put in and out of the stack is managed using the FILO (First-in Last-out) method, in which the data stored first is taken out later. Storing the data in this stack is called "Push", and reading the data from this stack is called "Pop". The stack pointer is advanced by "Push", and returned by "Pop".
  • In the Cortex-M processors, the stack operation is based on a “full-descending” stack model. This means the stack pointer always points to the last filled data in the stack memory, and the stack pointer predecrements for each new data store (PUSH) ( Figure 4.12. Stack PUSH and POP in the Cortex®-M processors.
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