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    Upvotes7Top Answeredited Apr 30, 2010 at 19:50

    Each of the 8051s interrupts has its own bit in the interrupt enable (IE) special function register (SFR) and is enabled by setting the corresponding bit. The code examples below are in 8051 assembly as well as C to provide a general idea of what is...

    #define IE (*(volatile unsigned char *)0xA8)
    #define BIT(x) (1 &lt&lt (x))
    ...
    IE &= ~BIT(7); /* clear bit 7 of IE (EA) to disable interrupts */
    ...
    IE |= BIT(0); /* set bit 0 of IE (EX0) to enable external interrupt 0 */
    ...
    IE |= BIT(1); /* set bit 3 of IE (EX1) to enable external interrupt 1 */
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  3. WebFeb 5, 2017 · Learn how to use GPIO interrupts or external interrupts of 8051 microcontroller with KEIL programming. See how to configure, …

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    How does a 8051 microcontroller work?Two ports on the 8051 microcontroller; pins 12 (INT0) and 13 (INT1) in port 3 can be used as external interrupts. Once the microcontroller gets a signal from an external device on these ports, it interrupts its operation and starts executing the ISR meant for the external interrupt.
    What are the interrupt sources present in 8051 microcontrollers?The interrupt sources present in 8051 microcontrollers are: The 8051 microcontroller generates the timers and the serial interrupts internally. While the external interrupts are generated via externally interfacing devices or switches that are connected to the microcontroller, these external interrupts can be edge-triggered or level-triggered.
    What are int0 & INT1 interrupts in microcontroller 8051?Microcontroller 8051 is consisting of two external hardware interrupts: INT0 and INT1 as discussed above. These interrupts are enabled at pin 3.2 and pin 3.3. It can be level triggered or edge triggered. In level triggering, low signal at pin 3.2 enables the interrupt, while at pin 3.2 high to low transition enables the edge triggered interrupt.
    How to enable/disable external interrupts in 8051?As you can see in the above diagram EX1 and EX0 bits are used to enable/disable external interrupts in 8051. The MSB of the IE register EA is meant to enable or disable the interrupts, writing 1 to it will tell the controller a interrupt is used and 0 will tell that no interrupt will be used.
    How many interrupts does a 8051 have?The 8051 has two timers/counters, a serial port, 4 general purpose parallel input/output ports, and interrupt control logic with five sources of interrupts. Besides internal RAM, the 8051 has various Special Function Registers (SFR) such as the accumulator, the B register, and many other control registers.
    What is the priority of 8051 interrupt?The priority in 8051 interrupt is based on their sources. External interrupts have higher priority as compared to internal interrupts like timer and serial and needs to be serviced first. What is the role of the interrupt Service Routine (ISR) in handling 8051 Interrupt?
  5. WebJun 15, 2012 · Learn how to use external interrupts 0 and 1 in 8051 microcontroller with examples and code. Understand the concept of interrupts, vector address, priority, TCON, IE and IP registers.

  6. WebJun 29, 2022 · Learn how to program external interrupts for 8051 microcontroller with examples and registers. Find out how to enable, disable, and configure external interrupts for level or edge triggering.

  7. WebAug 30, 2014 · Learn how to use external interrupts to control the microcontroller externally and execute specific commands. See the circuits, registers, steps and sample code for 8051 programming with …

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