TMS320F datasheet(73/389 Pages) TI

73 / 389 page

Branches, Calls, and Returns

5-9

Program Control

By the time the unconditional call instruction reaches the execute phase of the

pipeline, the next two instruction words have already been fetched. These two

instruction words are flushed from the pipeline with the following results:

- They are not executed.

- The return address is stored to the stack.

- Execution continues at the beginning of the called function.

The unconditional call instructions are CALL and CALA (call subroutine at

location specified by accumulator).

5.3.3

Unconditional Returns

When an unconditional return (RET) instruction is encountered, it is always

executed. When the return is executed, the PC is loaded with the value at the

top of the stack, and execution resumes at that address.

By the time the unconditional return instruction reaches the execute phase of

the pipeline, the next two instruction words have already been fetched. The

two instruction words are flushed from the pipeline with the following results:

- They are not executed.

- The return address is taken from the stack.

- Execution continues in the calling function.

TMS320F Datasheet(PDF) 73 Page - Texas Instruments