Texas Instruments TMS320C28x, Reference Manual

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Indirect Addressing Modes
5-10
5.6 Indirect Addressing Modes
This section includes indirect addressing modes for the 28x and 2xLP devices.
It also includes circular indirect addressing modes.
5.6.1 C28x Indirect Addressing Modes (XAR0 to XAR7)
AMODE ”loc16/loc32” Syntax Description
X
*XARn++
ARP = n
32bitDataAddr(31:0) = XARn
if(loc16), XARn = XARn + 1
if(loc32), XARn = XARn + 2
Example(s):
MOVL XAR2,#Array1 ; Load XAR2 with start address of Array1
MOVL XAR3,#Array2 ; Load XAR3 with start address of Array2
MOV @AR0,#N−1 ; Load AR0 with loop count N
Loop:
MOVL ACC,*XAR2++ ; Load ACC with location pointed to by XAR2,
; post−increment XAR2
MOVL *XAR3++,ACC ; Store ACC into location pointed to by XAR3,
; post−increment XAR3
BANZ Loop,AR0−− ; Loop until AR0 == 0, post−decrement AR0
AMODE ”loc16/loc32” Syntax Description
X
*−−XARn
ARP = n
if(loc16), XARn = XARn
− 1
if(loc32), XARn = XARn − 2
32bitDataAddr(31:0) = XARn
Example(s):
MOVL XAR2,#N*2 ; Load XAR2 with end address of Array1
MOVL XAR3,#N*2 ; Load XAR3 with end address of Array2
MOV @AR0,#N−1 ; Load AR0 with loop count N
Loop:
MOVL ACC,*−−XAR2 ; Pre−decrement XAR2,
; load ACC with location pointed to by XAR2
MOVL *−−XAR3,ACC ; Pre−decrement XAR3,
; store ACC into location pointed to by XAR3,
BANZ Loop,AR0−− ; Loop until AR0 == 0, post−decrement AR0