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Rti return from interrupt rti – Motorola DSP96002 User Manual

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MOTOROLA

DSP96002 USER’S MANUAL

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RTI

Return from Interrupt

RTI

Operation:

Assembler Syntax:

RTI

Description:

The program counter and the status register are pulled from the system stack. The interrupt routine pro-

gram counter and status register are lost. RTI if functionally identical to RTR but has been made a separate

instruction to be upward compatible with future parts and to simplify porting software.

Due to pipelining, the RTI instruction must not be immediately preceded by some instructions. See Sec-

tion A.10 for the list of restricted instructions.

CCR Condition Codes:

C

- Set according to value pulled from stack.

V

- Set according to value pulled from stack.

Z

- Set according to value pulled from stack.

N

- Set according to value pulled from stack.

I

- Set according to value pulled from stack.

LR

- Set according to value pulled from stack.

R

- Set according to value pulled from stack.

A

- Set according to value pulled from stack.

ER Status Bits:

INX

-Set according to value pulled from stack.

DZ

-Set according to value pulled from stack.

UNF

-Set according to value pulled from stack.

OVF

-Set according to value pulled from stack.

OPERR-Set according to value pulled from stack.

SNAN -Set according to value pulled from stack.

NAN

-Set according to value pulled from stack.

UNCC -Set according to value pulled from stack.

IER Flags:

SINX

-Set according to value pulled from stack.

SDZ

-Set according to value pulled from stack.

SUNF -Set according to value pulled from stack.

SOVF -Set according to value pulled from stack.

SIOP

-Set according to value pulled from stack.