Stereo System User Manual

MOTOROLA DSP96002 USER’S MANUAL A - 295
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.