Analog Devices ADSP-BF53x Blackfin Reference page 409

higher memory
P5
P1
R3 <-------- SP
...
lower memory
The Stack Pointer must already be 32-bit aligned to use this instruction. If
an unaligned memory access occurs, an exception is generated and the
instruction aborts.
Push/pop on
RETS
Push/pop on
RETI
Pushing enables the interrupt system, whereas popping
RETI
the interrupt system.
Pushing the Stack Pointer is meaningless since it cannot be retrieved from
the stack. Using the Stack Pointer as the destination of a pop instruction
(as in the fictional instruction
exception. (Refer to
information.)
Flags Affected
None
Required Mode
User & Supervisor for most cases.
Explicit accesses to
requires Supervisor mode. A protection violation exception results if any
of these registers are explicitly accessed from User mode.
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
[--sp]=p5 ;
[--sp]=p1 ;
[--sp]=r3 ;
has no effect on the interrupt system.
does affect the interrupt system.
SP=[SP++]
"Register Names" on page 1-13
, ,
USP SEQSTAT SYSCFG
Stack Control
) causes an undefined instruction
for more
, , , , and
RETI RETX RETN
disables
RETI
RETE
10-3