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BBC (SPC700)

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Revision as of 18:23, 23 July 2023 by Xetheria (talk | contribs) (improve description)
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Basic Info
Addressing Mode Opcode Length Speed
13 3 byte when condition is false: 5 cycles

when condition is true: 7 cycles

33 3 byte when condition is false: 5 cycles

when condition is true: 7 cycles

53 3 byte when condition is false: 5 cycles

when condition is true: 7 cycles

73 3 byte when condition is false: 5 cycles

when condition is true: 7 cycles

93 3 byte when condition is false: 5 cycles

when condition is true: 7 cycles

B3 3 byte when condition is false: 5 cycles

when condition is true: 7 cycles

D3 3 byte when condition is false: 5 cycles

when condition is true: 7 cycles

F3 3 byte when condition is false: 5 cycles

when condition is true: 7 cycles

Flags Clobbered
N V P B H I Z C
. . . . . . . .

BBC (Branch on Bit Clear) is an SPC700 instruction that performs a branch when a bit in the direct page is clear. The direct page byte that bit lives in is the first operand. The bit within that byte is a function of the high nibble of the opcode. The target relative address to jump to is the second operand.

See Also

External Links