Texas Instruments TMS320C3x 사용자 설명서

Group Addressing Mode Instruction Encoding

13-23

Assembly Language Instructions

Table 13–10. Indirect Addressing (Continued)

(c) Indirect addressing with index register IR1

10000

*+ AR

n(IR1)

addr = AR

n + IR1

With preindex (IR1) add

10001

* – AR

n(IR1)

addr = AR

n – IR1

With preindex (IR1) subtract

10010

* ++ AR

n(IR1)

addr = AR

n + IR1

AR

n = ARn + IR1

With preindex (IR1) add and modify

10011

* – – AR

n(IR1)

addr = AR

n – IR1

AR

n = ARn – IR1

With preindex (IR1) subtract and modify

10100

* AR

n ++ (IR1)

addr = AR

n

AR

n = ARn + IR1

With postindex (IR1) add and modify

10101

*AR

n – – (IR1)

addr = AR

n

AR

n = ARn – IR1

With postindex (IR1) subtract and modify

10110

* AR

n ++ (IR1)%

addr = AR

n

AR

n = circ(ARn + IR1)

With postindex (IR1) add and circular modify

 10111

* AR

n – – (IR1)%

addr = AR

n

AR

n = circ(ARn – IR1)

With postindex (IR1) subtract and circular modify

(d) Indirect addressing (special cases)

11000

*AR

n

addr = AR

n

Indirect

11001

*AR

n ++ (IR0)B

addr = AR

n

AR

n = B(ARn + IR0)

With postindex (IR0) add

and bit-reversed modify

addr

memory address

circ( )

address in circular addressing

AR

n

auxiliary registers AR0–AR7

++

add and modify by one

B

where bit-reversed addressing is performed

%

where circular addressing is performed

B()

bit-reversed address

IR

n

index register IR0 or IR1

– –

subtract and modify by one