Texas Instruments TMS320C3x - Manual (Page 166)

Indirect Addressing
6-13 Addressing Modes
Example 6–11. Indirect Addressing With Preindex Add
The address of the operand to fetch is the sum of an auxiliary register (AR n)
and an index register (IR0 or IR1).
Operation: operand address = AR n + IRm
Assembler Syntax: *+ AR n(IRm)
Modification Field: 01000 if m = 0
10000 if m = 1
(+)
0
0 31 24 23
Address x x AR n
31
IR m x
0
31
Index
Operand
x
24 23
Example 6–12. Indirect Addressing With Preindex Subtract
The address of the operand to fetch is the difference of an auxiliary register
(AR
n) and an index register (IR0 or IR1).
Operation: operand address = AR n – IRm
Assembler Syntax: *– AR n(IRm)
Modification Field: 01001 if m = 0
10001 if m = 1
(–)
0
0 31 24 23
Address x x AR n
31
IR m x
0
31
Index
Operand
x
24 23