An interrupt handle is a dedicated memory location stored in the microprocessor. This location holds information that indicates which interrupt source trigg...
An interrupt handle is a dedicated memory location stored in the microprocessor. This location holds information that indicates which interrupt source triggered the interrupt and provides details about the interrupt itself.
The microprocessor uses the interrupt handle to determine the source of the interrupt and then execute the appropriate response. It can also use the interrupt handle to store additional information that can be used for debugging or troubleshooting purposes.
An interrupt handle can be implemented in various ways, but it typically involves three main components:
Interrupt Vector: This is a table stored in memory that lists the addresses of interrupt service routines (ISRs). Each ISR corresponds to a specific interrupt source.
Interrupt Flag: This flag is set by the interrupting source to indicate that an interrupt has occurred.
Interrupt Handler: This is the code that is executed when an interrupt occurs.
When an interrupt occurs, the microprocessor sets the interrupt flag in the flag register. The CPU then starts the interrupt handler in the process table. The interrupt handler then executes the appropriate code to handle the interrupt.
Examples:
When the CPU encounters an interrupt from a disk, it sets the disk interrupt flag in the interrupt flag register.
When the CPU encounters an interrupt from a timer, it sets the timer interrupt flag.
When the CPU encounters an interrupt from a serial port, it sets the serial port interrupt flag.
Understanding interrupt handles is essential for understanding how the 8051 microprocessor handles interrupts. By understanding interrupt handles, you can debug and troubleshoot your system more effectively