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AT75C Datasheet(PDF) 72 Page - ATMEL Corporation |
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AT75C Datasheet(HTML) 72 Page - ATMEL Corporation |
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72 / 171 page  72 AT75C DSP Subsystem 1368C–INTAP–08/02 MACUS – Multiply Unsigned by Signed and Accumulate Previous Product Syntax: macus operand1, operand2, aX Operation: aX + shifted p –> aX operand1 –> y operand2 –> x unsigned y • signed x –> p Operands: y, direct address y, (rN) y, REG (rJ), (rI) (rN), ##long immediate Affected Flags: Cycles: 1 2 when the second operand is ##long immediate Words: 1 2 when the second operand is ##long immediate Notes: Shifted p means that the previous product is sign-extended into 36 bits, then shifted as defined by the PS field of status register st1. y –> y means that y retains its value. The REG cannot be aX, bX, p. The multiplication in macus (rJ), (rI), aX is between X-RAM and Y-RAM only, where rJ points to Y-RAM and rI points to X-RAM. Z M NVCE L R xxxxxxx – |
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