section 7 - Index of

MPY Signed Multiply MPYExplanation of Example 1: Prior to execution, the 24-bit X1 register contains the value$800000 (-1.0), the 24-bit Y1 register contains the value $COOOOO, (-0.5), and the 56-bitA accumulator contains the value $00:000000:000000 (0.0). The execution of the MPY­X1 ,Y1 ,A instruction multiples the 24-bit signed value in the X1 register by the 24-bitsigned value in the Y1 register, negates the 48-bit product, and stores the result in the56-bit A accumulator (-X1 *Y1 =-0.5=$FF:COOOOO:000000=A).Condition Codes:S -L -E -U -N -Z -V -15 14 13 12 11 10 9 8 7 6 5 4 3 2 0I LF I DM I T I •• I 81 I 80 I 11 I 10 I 8 I LIE I u I N I z v I : I.~ MR •. ~ CCR _.Computed according to the definition in A.5 CONDITION CODE COMPUTATIONSet if limiting occurred during parallel moveSet if the signed integer portion of A or B result is in useSet if A or B result is unnormalizedSet if bit 55 of A or B result is setSet if A or B result equals zeroSet if overflow has occurred in A or B resultNot~: The definitions of the E and U bits vary according to the scaling mode being used.Refer to Section A.5 CONDITION CODE COMPUTATION for complete details.Instruction Format 1:MPY (±)S1,S2,0MPY (±)S2,S1,0Opcode 1:23DATA BUS MOVE FIELDOPTIONAL EFFECTIVE ADDRESS EXTENSION8 7 4 3I 1 Q Q Q I d koo