Texas Instruments TMS320C28x User Manual

Indirect Addressing Modes
5-15C28x Addressing Modes
AMODE ”loc16/loc32” Syntax Description
X *0++ 32bitDataAddr(31:0) = XAR(ARP)
XAR(ARP) = XAR(ARP) + AR0
Note: The lower 16-bits of XAR0 are added to the selected 32-bit register. Upper
16-bits of XAR0 ignored. AR0 is treated as an unsigned 16-bit value.
Overflow into the upper 16-bits of XAR(ARP) can occur.
Example(s):
MOVL XAR2,#Array1 ; Load XAR2 with start address of Array1
MOVL XAR3,#Array2 ; Load XAR3 with start address of Array2
MOV @AR0,#4 ; Set AR0 to copy every fourth value from
; Array1 to Array2
MOV @AR1,#N−1 ; Load AR1 with loop count N
Loop:
NOP *,ARP2 ; Set ARP pointer to point to XAR2
MOVL ACC,*0++ ; Load ACC with location pointed to by XAR2,
; post−increment XAR2 by AR0
NOP *,ARP3 ; Set ARP pointer to point to XAR3
MOVL *++,ACC ; Store ACC into location pointed to by XAR3,
; post−increment XAR3
NOP *,ARP1 ; Set ARP pointer to point to XAR1
XBANZ Loop,*−− ; Loop until AR1 == 0, post−decrement AR1
AMODE ”loc16/loc32” Syntax Description
1 *0++,ARPn 32bitDataAddr(31:0) = XAR(ARP)
XAR(ARP) = XAR(ARP) + AR0
ARP = n
Note: The lower 16-bits of XAR0 are added to the selected 32-bit register. Upper
16-bits of XAR0 ignored. AR0 is treated as an unsigned 16-bit value.
Overflow into the upper 16-bits of XAR(ARP) can occur.
Example(s):
MOVL XAR2,#Array1 ; Load XAR2 with start address of Array1
MOVL XAR3,#Array2 ; Load XAR3 with start address of Array2
MOV @AR0,#4 ; Set AR0 to copy every fourth value from
; Array1 to Array2
MOV @AR1,#N−1 ; Load AR1 with loop count N
NOP *,ARP2 ; Set ARP pointer to point to XAR2
SETC AMODE ; Make sure AMODE = 1
.lp_amode ; Tell assembler that AMODE = 1
Loop:
MOVL ACC,*0++,ARP3 ; Load ACC with location pointed to by XAR2,
; post−increment XAR2 by AR0, set ARP pointer
; to point to XAR3
MOVL *++,ACC,ARP1 ; Store ACC into location pointed to by XAR3,
; post−increment XAR3, set ARP pointer to point
; to XAR1
XBANZ Loop,*−−,ARP2 ; Loop until AR1 == 0, post−decrement AR1,
; set ARP to point to XAR2

Texas Instruments TMS320C28x Specifications

General

Brand	Texas Instruments
Model	TMS320C28x
Category	Processor
Language	English