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Stack Pointer: Difference between revisions
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The '''Stack Pointer''' (SP) | The '''Stack Pointer''' (SP) points to the next [[stack]] location available for pushing to. In stack addressing modes it is used for the effective address. | ||
On the [[SPC700]] it is 16-bit, but the upper byte is fixed by the hardware to be 0x01. | |||
On the [[65c816]], the only two instructions that modify the stack pointer (S) directly are [[TCS]] and [[TXS]].<sup>[4]</sup> It is only fixed to be in page one in [[emulation mode]] on the '816. | On the [[65c816]], the only two instructions that modify the stack pointer (S) directly are [[TCS]] and [[TXS]].<sup>[4]</sup> It is only fixed to be in page one in [[emulation mode]] on the '816. | ||
1FFh is a common value to initialize the stack pointer to. | 1FFh is a common value to initialize the stack pointer to. | ||
Pushing things onto the [[stack]] decrements the stack pointer and pulling things increments it. | |||
=== See Also === | === See Also === | ||
* [[TSX]] | * [[TSX]] | ||
* [[TSC]] | |||
* [[PUSH]] | * [[PUSH]] | ||
* [[POP]] | * [[POP]] | ||
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# subparagraph 8.1.5 of [https://archive.org/details/SNESDevManual/book1/page/n182 page 3-8-4 of Book I] of the official Super Nintendo development manual | # subparagraph 8.1.5 of [https://archive.org/details/SNESDevManual/book1/page/n182 page 3-8-4 of Book I] of the official Super Nintendo development manual | ||
# diversified activities: [https://archive.org/details/SNESDevManual/book1/page/n183 page 3-8-5 of Book I], lbid. | # diversified activities: [https://archive.org/details/SNESDevManual/book1/page/n183 page 3-8-5 of Book I], lbid. | ||
# [[Eyes & Lichty]] | # [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/31 page 31] on The Stack Pointer | ||
# [[Eyes & Lichty]] | # [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/511 page 511] on TCS | ||
Latest revision as of 20:21, 12 November 2024
The Stack Pointer (SP) points to the next stack location available for pushing to. In stack addressing modes it is used for the effective address.
On the SPC700 it is 16-bit, but the upper byte is fixed by the hardware to be 0x01.
On the 65c816, the only two instructions that modify the stack pointer (S) directly are TCS and TXS.[4] It is only fixed to be in page one in emulation mode on the '816.
1FFh is a common value to initialize the stack pointer to.
Pushing things onto the stack decrements the stack pointer and pulling things increments it.
See Also
References
- subparagraph 8.1.5 of page 3-8-4 of Book I of the official Super Nintendo development manual
- diversified activities: page 3-8-5 of Book I, lbid.
- Eyes & Lichty, page 31 on The Stack Pointer
- Eyes & Lichty, page 511 on TCS