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STP

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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 CPU, putting it into a low power state until it is reset. The PHI2 clock is held high.

See Also

External Links

References

  1. 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