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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP80390 датащи(PDF) 37 Page - Digital Core Design |
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DP80390 датащи(HTML) 37 Page - Digital Core Design |
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37 / 84 page  DP80390 Instructions set details - 37 - 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. 3.12. DJNZ Instruction: DJNZ <byte>, <rel-addr> Function: Decrement and jump if not zero Description: DJNZ decrements the location indicated by 1, and branches to the address indicated by the second operand if the resulting value is not zero. An original value of 00 H will underflow to 0FF H. No flags are affected. The branch destination would be computed by adding the signed relative-displacement value in the last instruction byte to the PC, after incrementing the PC to the first byte of the following instruction. The location decremented may be a register or directly addressed byte. Note: When this instruction is used to modify an output port, the value used as the original port data will be read from the output data latch, not the input pins. 3.12.1. DJNZ RN, REL Operation: (PC) ← (PC) + 2 (Rn) ← (Rn) - 1 if (Rn) ≠ 0 then (PC) ← (PC) + rel Bytes: 2 Cycles: 4 Encoding: 1 1 0 1 1 r r r relative address |
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