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
| MOVX.A | Move source address-word to destination address-word | ||
| MOVX.[W] | Move source word to destination word | ||
| MOVX.B | Move source byte to destination byte | ||
| Syntax | MOVX.A src,dst | ||
| MOVX src,dst or MOVX.W src,dst | |||
| MOVX.B src,dst | |||
| Operation | src → dst | ||
| Description | The source operand is copied to the destination. The source operand is not affected. Both operands may be located in the full address space. | ||
| Status Bits | N: | Not affected | |
| Z: | Not affected | ||
| C: | Not affected | ||
| V: | Not affected | ||
| Mode Bits | OSCOFF, CPUOFF, and GIE are not affected. | ||
| Example | Move a 20-bit constant 18000h to absolute address-word EDE | ||
MOVX.A #018000h,&EDE ; Move 18000h to EDE
| Example | The contents of table EDE (word data, 20-bit addresses) are copied to table TOM. The length of the table is 030h words. | ||
MOVA #EDE,R10 ; Prepare pointer (20-bit address)
Loop MOVX.W @R10+,TOM-EDE-2(R10) ; R10 points to both tables.
; R10+2
CMPA #EDE+60h,R10 ; End of table reached?
JLO Loop ; Not yet
... ; Copy completed
| Example | The contents of table EDE (byte data, 20-bit addresses) are copied to table TOM. The length of the table is 020h bytes. | ||
MOVA #EDE,R10 ; Prepare pointer (20-bit)
MOV #20h,R9 ; Prepare counter
Loop MOVX.W @R10+,TOM-EDE-2(R10) ; R10 points to both tables.
; R10+1
DEC R9 ; Decrement counter
JNZ Loop ; Not yet done
... ; Copy completed
| 10 of the 28 possible addressing combinations of the MOVX.A instruction can use the MOVA instruction. This saves 2 bytes and code cycles. Examples for the addressing combinations are: | |||
MOVX.A Rsrc,Rdst MOVA Rsrc,Rdst ; Reg/Reg
MOVX.A #imm20,Rdst MOVA #imm20,Rdst ; Immediate/Reg
MOVX.A &abs20,Rdst MOVA &abs20,Rdst ; Absolute/Reg
MOVX.A @Rsrc,Rdst MOVA @Rsrc,Rdst ; Indirect/Reg
MOVX.A @Rsrc+,Rdst MOVA @Rsrc+,Rdst ; Indirect,Auto/Reg
MOVX.A Rsrc,&abs20 MOVA Rsrc,&abs20 ; Reg/Absolute
| The next 4 replacements are possible only if 16-bit indexes are sufficient for the addressing: | |||
MOVX.A z20(Rsrc),Rdst MOVA z16(Rsrc),Rdst ; Indexed/Reg
MOVX.A Rsrc,z20(Rdst) MOVA Rsrc,z16(Rdst) ; Reg/Indexed
MOVX.A symb20,Rdst MOVA symb16,Rdst ; Symbolic/Reg
MOVX.A Rsrc,symb20 MOVA Rsrc,symb16 ; Reg/Symbolic