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CHAPTER 6 DETAILED RULES FOR EXECUTION INSTRUCTIONS
6.14 BNC (Branch relative if C = 0)/BHS (Branch if Higher or
Same)
Execute the next instruction if the C-flag is 1 and the branch if it 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).
■ BNC (Branch relative if C = 0)/BHS (Branch if Higher or Same)
Operation
(C) = 1: (PC) ← (PC) + 2 (Word addition)
(C) = 0: (PC) ← (PC) + 2 + rel (Word addition)
Assembler format
BNC rel/BHS rel
Condition code (CCR)
+: Changed by executing instruction
-: Not changed
N: Not changed
Z: Not changed
V: Not changed
C: Not changed
Number of execution cycles: 4 (at divergence)/ 2 (at non-divergence)
Byte count: 2
OP code: F8
NZVC
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