Freescale Semiconductor StarCore SC140 - Manual (Page 690)

A-376 SC140 DSP Core Reference Manual
RTSTKD
RTSTKD
Restore PC from Stack
RTSTKD
Using a Delay Slot (AGU)
Description
Status and Conditions that Affect Instruction
Status and Conditions Changed by Instruction
Operation Assembler Syntax
(SP – 8)
→ PC
SP – 8
→ SP
RTSTKD
RTSTKD
Forces a return from a subroutine or exception by restoring the program counter (PC) from the active stack
in memory after executing the execution set in the delay slot. The restore to the PC is not from the RAS
register, even if RAS is valid. The implicit pop is done before the execution set in the delay slot is
executed.The stack pointer decrements by 8 and RAS becomes invalid. This instruction can be used to
bypass RAS (for example, when the return address is changed directly on the stack). RTSTK does one
32-bit long-word memory access.
Register Address Bit Name Description
SR[18] EXP Determines which stack pointer is used.
Register Address Bit Name Description
EMR [3] NMID Cleared .