Texas Instruments TMS320C28x - Page 275

IRET
6-118
Example
; Full interrupt context Save and Restore:
; Vector table:
INTx: .long INTxService ; INTx interrupt vector
.
.
.
; Interrupt context save:
INTxService: ; ACC, P, T, ST0, ST1, DP, AR0,
; AR1, IER, DPGSTAT registers saved
; on stack.
; Return PC saved on stack.
; IER bit corresponding to INTx
; is disabled.
; ST1(EALLOW bit = 0).
; ST1(LOOP bit = 0).
; ST1(DBGM bit = 1).
; ST1(INTM bit = 1).
PUSH AR1H:AR0H ; Save remaining registers.
PUSH XAR2
PUSH XAR3
PUSH XAR4
PUSH XAR5
PUSH XAR6
PUSH XAR7
PUSH XT
; Interrupt user code:
.
.
.
; Interrupt context restore:
POP XT ; Restore registers.
POP XAR7
POP XAR6
POP XAR5
POP XAR4
POP XAR3
POP XAR2
POP AR1H:AR0H
IRET ; Return from interrupt.