8085 Interrupts

Types of Interrupts in 8085

Types of Interrupts in 8085: The 8085 has multilevel interrupt system. It supports two Types of Interrupts in 8085: Hardware     Software Hardware : Some pins on the 8085 allow, peripheral device to interrupt the main program for I/O operations. When an interrupt occurs, the 8085 completes the instruction it is currently executing and transfers the …

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Polling and Interrupts

Polling and Interrupts: In Polling and Interrupts of the microprocessor’s software simply checks each of the I/O devices every so often. During this check, the microprocessor tests to see if any device needs servicing. Fig. 5.1 shows the flow chart for polling subroutine. This is a simple program which services I/O ports A, B, and …

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