Datasheet

Instruction Set Description www.ti.com
4.6.3.17 MOVX
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
MOVX.A src,dst
Syntax
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
Ten of the 28 possible addressing combinations of the MOVX.A instruction can use the
MOVA instruction. This saves two 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
232
CPUX SLAU144J–December 2004–Revised July 2013
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