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Stack Pointer: Difference between revisions
From SnesLab
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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] | ||
# [[Eyes & Lichty]] | # [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/511 page 511] on TCS | ||
Revision as of 21:42, 6 August 2024
The Stack Pointer (SP) on the SPC700 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.
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
- Eyes & Lichty, page 511 on TCS