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After receiving an interrupt, the microcontroller interrupts what ever it is doing and The 8051 has two external hardware interrupts PIN 12 (P3.2) and Pin 13 Same thing happens in microcontrollers. 8051 architecture handles 5 interrupt sources, out of which two are internal (Timer Interrupts), two are external and one8051 Microcontroller has six interrupt sources as shown in the table INT0 and INT1 are external interrupts on P3.2 and P3.3 1 Feb 2017 The interrupts sources present in 8051 microcontroller are: Reset interrupt. Timer0 overflow interrupt TF0. Timer1 overflow interruptTF1. External hardware interrupt INT0. External hardware interrupt INT1. Serial communication interrupt (RI/TI) 12 Nov 2011 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 This example program demonstrates how to program the external interrupt 0 (/INT0) pin as a falling-edge interrupt source. The programming procedure in 8051 is as follows: Enable the corresponding bit of external interrupt in IE register. If it is level triggering, just write the subroutine appropriate to this interrupt, or else enable the TCON register bit corresponding to the edge triggered interrupt – whether it is INT0 or INT1. The 8051 has two external hardware interrupts PIN 12 (P3.2) and Pin 13 (P3.3) of the 8051, designated as INT0 and INT1 are used as external hardware 16 Aug 2012 External interrupt handling of 8051 micro controller-how interrupts work, vector address, interrupt priority and how to write an ISR (interrupt The AT89S8253 has a total of six interrupt vectors: two external interrupts (INT0 and INT1), three timer interrupts (Timers 0, 1, and 2), and the serial port interrupt. Each of these interrupts sources can be individually enabled or disabled by setting or clearing a bit in Special Function Register IE.