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STP: Difference between revisions
From SnesLab
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!colspan="8"|Flags Affected | !colspan="8"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[Decimal Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
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|. | |. | ||
Revision as of 04:25, 27 November 2023
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Implied (type 3) | DB | 1 byte | 3 cycles | ||||
| Flags Affected | |||||||
|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C |
| . | . | . | . | . | . | . | . |
STP (SToP-the-clock)[1] is an instruction that halts the 65c816, putting it into a low power state until it is reset. The PHI2 clock is held high.
See Also
External Links
- Eyes & Lichty page 504, on STP: https://archive.org/details/0893037893ProgrammingThe65816/page/n530
- Labiak page on STP: https://archive.org/details/Programming_the_65816/page/n195
- snes9x implementation of STP: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L3328
- undisbeliever on STP: https://undisbeliever.net/snesdev/65816-opcodes.html#stp-stop-the-processor
References
- Although "Stop The Processor" fits, all the letters in this mnemonic are from the word "stop." See row 58 of Table 5-1, "Instruction Set Table" on Page 21 of the official 65c02 datasheet: https://www.westerndesigncenter.com/wdc/documentation/w65c02s.pdf