Freescale Semiconductor StarCore SC140 - Manual (Page 689)

RTSTK
SC140 DSP Core Reference Manual A-375
Example
rtstk
Instruction Formats and Opcodes
Instruction Comment
- - -
jsr SUB
Jump to subroutine at SUB. Push the PC and SR onto the
stack.
- - - Skip over these instructions.
SUB MOVE.w #$16,d4 Execute the subroutine here.
- - -
move.w #lbl,(SP-8) Change the original value in the stack for PC to lbl.
rtstk Restore the new value lbl to PC.
move.l #$16,d5 This instruction skipped.
lbl move.l #$16,d6 Continue executing here.
Instruction Words Cycles
1
Note 1: RTSTK uses 5 cycles if the shadow SP is valid. RTSTK uses 6 cycles if the shadow SP is not valid.
Type Opcode
15 8 7 0
RTSTK 1 5/6 4 1 0 0 1 1 1 1 1 0 1 1 1 0 1 0 1