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Stack Pointer: Difference between revisions
From SnesLab
(only fixed to page one in emulation mode) |
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On the [[65c816]], the only two instructions that modify the stack pointer directly are [[TCS]] and [[TXS]]. 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 directly are [[TCS]] and [[TXS]]. 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 === | === See Also === | ||
Revision as of 16:01, 22 July 2024
The Stack Pointer 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 directly are TCS and TXS. 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, https://archive.org/details/0893037893ProgrammingThe65816/page/31