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Standard Operation for Maskable Interrupts
3-16
If you want the ISR to inform a peripheral that the interrupt is being serv-
iced, you can use the IACK instruction to send an interrupt acknowledge
signal. The IACK instruction accepts a 16-bit constant as an operand. For
a detailed description of the IACK instruction, see Chapter 6,
C28x As-
sembly Language Instructions
.
14)
Program continues.
If the interrupt is not approved by the CPU, the inter-
rupt is ignored, and the program continues uninterrupted. If the interrupt
is approved, its interrupt service routine is executed and the program con-
tinues where it left off (at the return address).
Example 3
−
1. Typical ISR
C28x Full Context Save/Restore
INTX:
.; 8
cycles
PUSH
AR1H:AR0H
; 32-bit
PUSH
XAR2
; 32-bit
PUSH
XAR3
; 32-bit
PUSH
XAR4
; 32-bit
PUSH
XAR5
; 32-bit
PUSH
XAR6
; 32-bit
PUSH
XAR7
; 32-bit
PUSH XT
;
32-bit
; +8 = 16 cycles
.
.
.
POP
XT
POP
XAR7
POP
XAR6
POP
XAR5
POP
XAR4
POP
XAR3
POP
XAR2
POP
XAR1H;AR0H
IRET
; 16 cycles
Summary of Contents for TMS320C28x
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Page 269: ...IN loc16 PA 6 112 MOV AL 0 AL 0 UOUT IORegC AL IOspace IORegC AL 10...
Page 308: ...MAXCUL P loc32 6 151 Saturate MOVL Var64 2 ACC Store result into Var64 MOVL Var64 P...
Page 509: ...SUBL ACC P PM 6 352 SUBL ACC P PM ACC S B 11 M X 4 MOVH Y ACC 5 Store Q15 result into Y...
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