Obtain the control word for the following configuration of the ports of 8255 A for mode 1 operation: Port A – as output port, Mode for Port A – mode 1 Port B – output port, Mode for Port B ...
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Write initialisation instructions for the 8255A to set up: PORT A as an output port in Mode 0 PORT B as an output port in Mode 1 for interrupt I/O PORT C (Upper) as an output port in Mode 0.
Elaborate how interrupts are handled by 8259 and how priorities are assigned..
Elaborate how interrupts are handled by 8259 and how priorities are assigned.
Find the values of CS,A1,A0 in 8255 for the following cases: Port A selection Port B selection Port C selection Control Register selection