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DP80390 датащи(PDF) 61 Page - Digital Core Design |
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DP80390 датащи(HTML) 61 Page - Digital Core Design |
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61 / 84 page ![]() DP80390 Instructions set details - 61 - 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. 3.27. MUL Instruction: MUL AB Function: Multiply Description: MUL AB multiplies the unsigned eight-bit integers in the accumulator and register B. The low-order byte of the sixteen-bit product is left in the accumulator, and the high-order byte in B. If the product is greater than 255 (0FF H) the overflow flag is set; otherwise it is cleared. The carry flag is always cleared. Operation: (PC) ← (PC) + 1 (A) ← (A) x (B) – result’s bits 7..0 (B) ← (A) x (B) – result’s bits 15..8 Bytes: 1 Cycles: 2 Encoding: 1 0 1 0 0 1 0 0 |
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