TMS320F datasheet(94/389 Pages) TI

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Indirect Addressing Mode

6-10

- Increment or decrement by an index amount using reverse carry. The

value in AR0 is the index amount. After the instruction uses the content of

the current auxiliary register as the data-memory address, that content is

incremented or decremented by the index amount. The addition and sub-

traction process is accomplished with the carry propagation reversed for

fast Fourier transforms (FFTs).

These four option types provide the seven indirect addressing options listed

in Table 6–1. The table also shows the instruction operand that corresponds

to each indirect addressing option and gives an example of how each option

is used.

Table 6–1. Indirect Addressing Operands

Operand

Option

Example

No increment or decrement

LT * loads the temporary register (TREG) with the content of the

data memory address referenced by the current AR.

Increment by 1

LT *+ loads the temporary register (TREG) with the content of

the data memory address referenced by the current AR and

then adds 1 to the content of the current AR.

*–

Decrement by 1

LT *– loads the temporary register (TREG) with the content of

the data memory address referenced by the current AR and

then subtracts 1 from the content of the current AR.

*0+

Increment by index amount

LT *0+ loads the temporary register (TREG) with the content of

the data memory address referenced by the current AR and

then adds the content of AR0 to the content of the current AR.

*0–

Decrement by index amount

LT *0– loads the temporary register (TREG) with the content of

the data memory address referenced by the current AR and

then subtracts the content of AR0 from the content of the

current AR.

*BR0+

Increment by index amount,

adding with reverse carry

LT *BR0+ loads the temporary register (TREG) with the con-

tent of the data memory address referenced by the current AR

and then adds the content of AR0 to the content of the current

AR, adding with reverse carry propagation.

*BR0–

Decrement by index amount,

subtracting with reverse carry

LT *BR0– loads the temporary register (TREG) with the con-

tent of the data memory address referenced by the current AR

and then subtracts the content of AR0 from the content of the

current AR, subtracting with bit reverse carry propagation.

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