Texas Instruments TMS320C3x - Manual (Page 480)

Group Addressing Mode Instruction Encoding
13-22
Table 13–10. Indirect Addressing
(a) Indirect addressing with displacement
Mod Field Syntax Operation Description
00000 *+AR n(disp) addr = AR n + disp With predisplacement add
00001 *– AR n(disp) addr = AR n – disp With predisplacement subtract
00010 *++AR n(disp) addr = AR n + disp
AR n = ARn + disp
With predisplacement add and modify
00011 *– – AR n(disp) addr = AR n – disp
AR n = ARn – disp
With predisplacement subtract and modify
00100 *AR n++(disp) addr = AR n
AR n = ARn + disp
With postdisplacement add and modify
00101 *AR n – – (disp) addr = AR n
AR n = ARn – disp
With postdisplacement subtract and modify
00110 *AR n++(disp)% addr = AR n
AR n = circ(ARn + disp)
With postdisplacement add and circular modify
00111 *AR n––(disp)% addr = AR n
AR n = circ(ARn – disp)
With postdisplacement subtract and circular modify
(b) Indirect addressing with index register IR0
Mod Field Syntax Operation Description
01000 *+AR n(IR0) addr = AR n + IR0 With preindex (IR0) add
01001 *– AR n(IR0) addr = AR n – IR0 With preindex (IR0) subtract
01010 *++AR n(IR0) addr = AR n + IR0
AR n = ARn + IR0
With preindex (IR0) add and modify
01011 * – – AR n(IR0) addr = AR n – IR0
AR n = ARn – IR0
With preindex (IR0) subtract and modify
01100 *AR n++(IR0) addr = AR n
AR n = ARn + IR0
With postindex (IR0) add and modify
01101 *AR n – – (IR0) addr= AR n
AR n = ARn – IR0
With postindex (IR0) subtract and modify
01110 *AR n++(IR0)% addr = AR n
AR n = circ(ARn + IR0)
With postindex (IR0) add and circular modify
01111 *AR n – – (IR0)% addr = AR n
AR n = circ(ARn – IR0)
With postindex (IR0) subtract and circular modify
Legend: addr memory address ++ add and modify
AR n auxiliary registers AR0–AR7 – – subtract and modify
circ( ) address in circular addressing % where circular addressing is performed
disp displacement IR n index register IR0 or IR1