Reference no: EM13165319
An MSP430-based system interfaces 4 external devices (ED0, ED1, ED2, ED3), each capable of generating an
interrupt request. The external devices place a request by setting the request line (a transition from a logic one to
a logic zero). The request lines are connected on port 1 pins P1.7, P1.6, P1.5, and P1.4, respectively. A request
line is kept active as long as the interrupt request is pending, until the request is serviced. Answer the following
questions.
If multiple requests occur at the same time, ED0 should have the lowest priority and ED3 the
highest priority. Once in the service routine multiple requests should be serviced if pending. Outline the main
steps taken in the interrupt service routine for port 1.
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An msp430-based system interfaces 4 external devices
: An MSP430-based system interfaces 4 external devices (ED0, ED1, ED2, ED3), each capable of generating an interrupt request.
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