Texas Instruments TMS320C28x User Manual

Stack Addressing Modes (SP)
5-9C28x Addressing Modes
5.5 Stack Addressing Modes (SP)
AMODE ”loc16/loc32” Syntax Description
0
*−SP[6bit]
32bitDataAddr(31:16) = 0x0000
32bitDataAddr(15:0) = SP − 6bit
Note: The 6-bit offset value is subtracted from the current 16-bit SP register val-
ue. The offset value enables 0 to 63 words to be addressed relative to the
current SP register value.
Example(s):
ADD AL,*−SP[5] ; Add 16-bit contents from stack location
; −5 words from top of stack to AL register
MOV *-SP[8],AL ; Store 16-bit AL register to stack location
; -8 words from top of stack
ADDL ACC,*−SP[12] ; Add 32-bit contents from stack location
; −12 words from top of stack to ACC register.
MOVL *-SP[34],ACC ; Store 32-bit ACC register to stack location
; −34 words from top of stack
AMODE ”loc16/loc32” Syntax Description
X *SP++ 32bitDataAddr(31:16) = 0x0000
32bitDataAddr(15:0) = SP
if(loc16), SP = SP + 1
if(loc32), SP = SP + 2
Example(s):
MOV *SP++,AL ; Push contents of 16-bit AL register onto top
; of stack
MOVL *SP++,P ; Push contents of 32-bit P register onto top
; of stack
AMODE ”loc16/loc32” Syntax Description
X *−−SP if(loc16), SP = SP − 1
if(loc32), SP = SP − 2
32bitDataAddr(31:16) = 0x0000
32bitDataAddr(15:0) = SP
Example(s):
ADD AL,*−−SP ; Pop contents from top of stack and add to 16-bit
; AL register
MOVL ACC,*−−SP ; Pop contents from top of stack and store in
; 32-bit ACC register
Note: This addressing mode can only access the lower 64K of data address space on the C28x device.

Texas Instruments TMS320C28x Specifications

General

Brand	Texas Instruments
Model	TMS320C28x
Category	Processor
Language	English