External Hardware-Interrupts

External hardware-interrupts are generated by controllers of external devices or coprocessors and are connected to the processor pin for Non Mask able Interrupts (NMI) or to the pin for Mask able Interrupts (INTR). The NMI line is generally booked for interrupts that occur because of fatal errors like a power distortion or parity error.

Interrupts from external devices may also be associated to the processor via the Intel 8259A Programmable Interrupt Controller (PIC). The CPU utilizes a group of I/O ports to control the PIC and the PIC puts its signals on the INTR pin. The PIC makes possible to enable or disable interrupts and to change the priority levels under supervision of a program.

The instructions CLI and STI may be utilized to enable/disable interrupts on the INTR pin, it has not any effect on NMI interrupts.

 

Posted Date: 10/10/2012 8:13:42 AM | Location : United States

Ask an Expert

Related Discussions:- External hardware-interrupts-microprocessor, Assignment Help, Ask Question on External hardware-interrupts-microprocessor, Get Answer, Expert's Help, External hardware-interrupts-microprocessor Discussions

Write discussion on External hardware-interrupts-microprocessor
Your posts are moderated

Write your message here..

Related Questions

Shl/sal-logical instruction-microprocessor, SHL/SAL : Shift logical/Arithm... SHL/SAL : Shift logical/Arithmetic Left: These instructions shift the operand byte or word bit by bit to the left and insert 0 in the newly introduced least significant bits. In c

Help with homework (python), i have trying to do the homework but there is ... i have trying to do the homework but there is a mistake. (Counting positive and negative numbers and computing the average of numbers) write a program that reads an unspecified nu

Control transfer or branching instruction-microprocessor, Control Transfer ... Control Transfer or Branching Instruction Control transfer instructions transfer the flow of execution of the program to a new address specified in the instruction indirectly o

Program to generate waveforms connected, Write a 68hc11 assembly language p... Write a 68hc11 assembly language program which generation of the following waveforms connected to your DAC i)   Square wave ii)  Saw tooth waveform iii) Sine wave iv) U

Eeprom programming, how to store a bulk data in a external eeprom how to store a bulk data in a external eeprom

CONSTANTS, Ask question #MinimuWHAT ARE CONSTANTS AND WHAT DO THEY DO?m 100... Ask question #MinimuWHAT ARE CONSTANTS AND WHAT DO THEY DO?m 100 words accepted#

Calculator, how to add 111 and 333 in assembly language how to add 111 and 333 in assembly language

8255 programmable peripheral interface-microprocessor, 8255 Programmable Pe... 8255 Programmable Peripheral Interface Intel's 8255 A programmable peripheral interface provides a nice instance of a parallel  interface. As shown the interface have a control

Homework, Hello Hello

Architecture of 8088-microprocessor, Architecture Of 8088 The register ... Architecture Of 8088 The register set of 8088 is accurately the same as in to 8086. The architecture of 8088 is also same to 8086 except for 2 changes; a) 8088 has 4-byte instr