Question
Download Solution PDFThe 8051 can handle ______ interrupt sources.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
An interrupt is an event that occurs randomly in the continuation of something depending upon call priority, you decide whether to neglect or attend it.
8051 architecture handles 5 interrupt sources, out of which two are internal (Timer interrupts), two are external and one is a serial interrupt. Each of their interrupts has its vector address.
The highest interrupt priority upon reset in 8051 is external interrupt 0.
|
Priority |
Interrupt source |
Interrupt Bit / flag |
|
1 |
External Interrupt 0 |
INT 0 |
|
2 |
Timer Interrupt 0 |
TF 0 |
|
3 |
External Interrupt 1 |
INT 1 |
|
4 |
Timer Interrupt 1 |
TF 1 |
|
5 |
Serial Interrupt |
TI / RI |
Hence option (4) is the correct answer.
As per 8051 interrupt priority, the lowest priority interrupts are not served until the microcontroller is finished with higher priority interrupts.
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