Serial Interrupt in AT89s52

Interrupt routine are those routine whose actions are immediate.Actually instruction written in any program are executed sequentially but Interrupt instruction when encountered while execution stops all other sequential instruction and executes itself. After completion of execution of interrupt instruction, the previously stopped sequential instructions are fetched and then executed again.

UART in AT89s52 / Serial communication using AT89s52

UART (Universal Asynchronous Receiver Transmitter), a hardware component which are available in almost every microcontroller is used to transmit a byte of data serially through a single wire. It converts a parallel sequence of data into serial data i,e bitwise data to communicate between devices through single wire.