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CHAPTER 6 DETAILED RULES FOR EXECUTION INSTRUCTIONS
6.12 BN (Branch relative if N = 1)
Execute the next instruction if the N-flag is 0 and the branch if it is 1. 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).
■ BN (Branch relative if N = 1)
Operation
N = 0: (PC) ← (PC) + 2 (Word addition)
N = 1: (PC) ← (PC) + 2 + rel (Word addition)
Assembler format
BN 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: FB
NZVC
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