rtd DM5816, User Manual

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DM5816/DM6816 RTD Embedded Technologies, Inc.
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What Is an Interrupt?............................................................................................................................ 33
Interrupt Request Lines........................................................................................................................ 34
8259 Programmable Interrupt Controller ............................................................................................. 34
What Exactly Happens When an Interrupt Occurs? ............................................................................ 35
Using Interrupts in Your Programs....................................................................................................... 35
Writing an Interrupt Service Routine (ISR) .......................................................................................... 35
Saving the Startup Interrupt Mask Register (IMR) and Interrupt Vector.............................................. 37
Restoring the Startup IMR and Interrupt Vector .................................................................................. 37
Common Interrupt Mistakes................................................................................................................. 38
Appendix A – DM5816/DM6816 Specifications .......................................................................................... 39
Appendix B – Connector Pin Assignments ................................................................................................. 41
Appendix C – Component Data Sheets ...................................................................................................... 43
Appendix D - Limited Warranty ................................................................................................................... 44