Indirect Addressing Modes - Texas Instruments TMS320C28x Reference Manual

Indirect Addressing Modes

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