Freescale-semiconductor ColdFire MCF52210 Manual de usuario descargar pdf (Pagina 90)

100

101

Multiply-Accumulate Unit (MAC)

MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2

4-14 Freescale Semiconductor

then {if (inst == MSAC)

then result[31:0] = acc[31:0] - product[31:0]

else result[31:0] = acc[31:0] + product[31:0]

}

/* check for accumulation overflow */

if (accumulationOverflow == 1)

then {MACSR.V = 1

if (inst == MSAC && MACSR.OMC == 1)

then result[31:0] = 0x0000_0000

else if (MACSR.OMC == 1)

then /* overflowed MAC,

saturationMode enabled */

result[31:0] = 0xffff_ffff

}

/* transfer the result to the accumulator */

acc[31:0] = result[31:0]

MACSR.N = result[31]

if (result[31:0] == 0x0000_0000)

then MACSR.Z = 1

else MACSR.Z = 0

}

break;}

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Freescale-semiconductor ColdFire MCF52210 Manual de usuario Pagina 90

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