Draw a block diagram of a circuit that will interface two interrupts, INT0 and INT1, to the INT input of a CPU so that INT1 has the higher priority and INT0 has the lower. In other words, a signal on INT1 is to be able to interrupt the CPU even when the CPU is currently handling an interrupt generated by INT0, but not vice versa.
What will be an ideal response?
Analysis:
There are two types of interrupts: non-maskable, and maskable. When a logic signal is applied to a maskable interrupt input (INT1 in this case), the microprocessor is immediately interrupted. When a logic signal is applied to a maskable input (INT0 in this case), the microprocessor is interrupted only if that particular input is enabled. Maskable interrupts are disabled or enabled under program control.
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