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Explain the action of an interrupt processing routine?
Action of an interrupt processing routine is as follows:
1. Save contents of registers of CPU. This action is not essential if the CPU registers are saved through the interrupt action itself.
2. Process the interrupt as well as take suitable actions. The interrupt code field of saved PSW information unit consequent to this interrupt consists of useful information for this reason.
3. Return from interrupt processing.
Suppose that the working register W contains the value 0x4F, the register FSR contains the value 0x2B; the register with address 0x2B contains 0x2F and the instruction ADDWF INDF,
Describe the 8251 A programmable communication interface
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Design a counter modulo 4 (sequential circuit with two flip-flops and one input U) which work like that: 1. When U=0, the state of the flip-flop does not change. 2. Whe
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