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The signal that may be used either to interrupt the CPU or polled by the CPU is

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The signal that may be used either to interrupt the CPU or polled by the CPU is

(a) TXRDY(Transmitter ready)

(b) RXRDY(Receiver ready output)

(c) DSR(active low)

(d) DTR(active low)

The question was asked in an interview.

This question is from Programmable Communication Interface 8251 USART in division Special Purpose Programmable Peripheral devices and their Interfacing of Microprocessor

1 Answer

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by (49.2k points)
The correct option is (b) RXRDY(Receiver ready output)

For explanation: RXRDY(Receiver ready output) may be used either to interrupt the CPU or polled by the CPU.

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