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e. Interrupt Flags i. Edge vs. level a. Clearing a flag

e. Interrupt Flags

i. Edge vs. level
a. Clearing a flag

Engineering   Electrical-Engineering   
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Answer #1

Interrupts may be globally disabled by setting the flag to one.

On reset the flag is set.

Clear the flag to enable interrupts.

Edge level
1. A high to low signal triggers the interrupt 1.default made upon reset of the 8051
2.Need to set TCON.0(IT0)/TCON.2(IT1) 2.A low-level signal triggers the interrupt.
3.TCON.1(IE0) AND TCON.3(IE1) are set when an falling edge is detected and cleared by RETI 3.The low signal must be held low before the execution of ISR and must be removed before RETI

Clearing a flag:

In microproccessor causing a flag to become 0 is clearing a flag

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