SLAU367P October 2012 – April 2020 MSP430FR5041 , MSP430FR5043 , MSP430FR50431 , MSP430FR5847 , MSP430FR58471 , MSP430FR5848 , MSP430FR5849 , MSP430FR5857 , MSP430FR5858 , MSP430FR5859 , MSP430FR5867 , MSP430FR58671 , MSP430FR5868 , MSP430FR5869 , MSP430FR5870 , MSP430FR5872 , MSP430FR58721 , MSP430FR5887 , MSP430FR5888 , MSP430FR5889 , MSP430FR58891 , MSP430FR5922 , MSP430FR59221 , MSP430FR5947 , MSP430FR59471 , MSP430FR5948 , MSP430FR5949 , MSP430FR5957 , MSP430FR5958 , MSP430FR5959 , MSP430FR5962 , MSP430FR5964 , MSP430FR5967 , MSP430FR5968 , MSP430FR5969 , MSP430FR5969-SP , MSP430FR59691 , MSP430FR5970 , MSP430FR5972 , MSP430FR59721 , MSP430FR5986 , MSP430FR5987 , MSP430FR5988 , MSP430FR5989 , MSP430FR5989-EP , MSP430FR59891 , MSP430FR5992 , MSP430FR5994 , MSP430FR59941 , MSP430FR6005 , MSP430FR6007 , MSP430FR6035 , MSP430FR6037 , MSP430FR60371 , MSP430FR6041 , MSP430FR6043 , MSP430FR60431 , MSP430FR6045 , MSP430FR6047 , MSP430FR60471 , MSP430FR6820 , MSP430FR6822 , MSP430FR68221 , MSP430FR6870 , MSP430FR6872 , MSP430FR68721 , MSP430FR6877 , MSP430FR6879 , MSP430FR68791 , MSP430FR6887 , MSP430FR6888 , MSP430FR6889 , MSP430FR68891 , MSP430FR6920 , MSP430FR6922 , MSP430FR69221 , MSP430FR6927 , MSP430FR69271 , MSP430FR6928 , MSP430FR6970 , MSP430FR6972 , MSP430FR69721 , MSP430FR6977 , MSP430FR6979 , MSP430FR69791 , MSP430FR6987 , MSP430FR6988 , MSP430FR6989 , MSP430FR69891
Examples for all multiplier modes follow. All 8×8 modes use the absolute address for the registers, because the assembler does not allow .B access to word registers when using the labels from the standard definitions file.
There is no sign extension necessary in software. Accessing the multiplier with a byte instruction during a signed operation automatically causes a sign extension of the byte within the multiplier module.
; 32x32 Unsigned Multiply
MOV #01234h,&MPY32L ; Load low word of 1st operand
MOV #01234h,&MPY32H ; Load high word of 1st operand
MOV #05678h,&OP2L ; Load low word of 2nd operand
MOV #05678h,&OP2H ; Load high word of 2nd operand
; ... ; Process results
; 16x16 Unsigned Multiply
MOV #01234h,&MPY ; Load 1st operand
MOV #05678h,&OP2 ; Load 2nd operand
; ... ; Process results
; 8x8 Unsigned Multiply. Absolute addressing.
MOV.B #012h,&MPY_B ; Load 1st operand
MOV.B #034h,&OP2_B ; Load 2nd operand
; ... ; Process results
; 32x32 Signed Multiply
MOV #01234h,&MPYS32L ; Load low word of 1st operand
MOV #01234h,&MPYS32H ; Load high word of 1st operand
MOV #05678h,&OP2L ; Load low word of 2nd operand
MOV #05678h,&OP2H ; Load high word of 2nd operand
; ... ; Process results
; 16x16 Signed Multiply
MOV #01234h,&MPYS ; Load 1st operand
MOV #05678h,&OP2 ; Load 2nd operand
; ... ; Process results
; 8x8 Signed Multiply. Absolute addressing.
MOV.B #012h,&MPYS_B ; Load 1st operand
MOV.B #034h,&OP2_B ; Load 2nd operand
; ... ; Process results