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DP80390 Fiches technique(PDF) 45 Page - Digital Core Design |
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DP80390 Fiches technique(HTML) 45 Page - Digital Core Design |
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45 / 84 page ![]() DP80390 Instructions set details - 45 - All trademarks mentioned in this document http://www.DigitalCoreDesign.com are trademarks of their respective owners. http://www.dcd.pl Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved. 3.18. JNB Instruction: JNB bit,rel Function: Jump if bit is not set Description: If the indicated bit is a zero, branch to the indicated address; otherwise proceed with the next instruction. The branch destination is computed by adding the signed relative-displacement in the third instruction byte to the PC, after incrementing the PC to the first byte of the next instruction. The bit tested is not modified. No flags are affected. Operation: (PC) ← (PC) + 3 if (bit) = 0 then (PC) ← (PC) + rel. Bytes: 3 Cycles: 5 Encoding: 0 0 1 1 0 0 0 0 bit address relative address |
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