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CHAPTER 6 DETAILED RULES FOR EXECUTION INSTRUCTIONS
6.7 BBC (Branch if Bit is Clear)
Branch when the value of bit b in dir memory is 0. Branch address corresponds to the
value of addition between the PC value (word value) of the next instruction and the
value with rel code-extended (word value).
■ BBC (Branch if Bit is Clear)
Operation
(bit)b = 0: (PC) ← (PC) + 3 + rel (Word addition)
(bit)b = 1: (PC) ← (PC) + 3 (Word addition)
Assembler format
BBC dir:b, rel
Condition code (CCR)
+: Changed by executing instruction
-: Not changed
N: Not changed
Z: Set to 1 when the value of dir:b is 0 and set to 0 when it is 1.
V: Not changed
C: Not changed
Number of execution cycles: 5
Byte count: 3
OP code: B0 to B7
NZVC
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