This book is ideal text book for Engineers, hobbyist, enthusiast for electronics projects and understanding. This is concise book which covers 8051, PIC, ARM7, MSP430 and ARM cortex programming. This books shows how to use Keil compiler for various target devices like P89v51RD2, PIC 16F877A, MSP430, LPC2148, LPC1768. These all microcontrollers are heavily used in Embedded system design. But this is not book for C programming or Embedded C programming. Readers can acquired syntax usage of C programming from Youtube or Google. Exercises are included to try out project ideas. This book covers assignment work of BE electronics, BE IT,BE (Electrical), BE(Mechanical) for Mechatronics, MSc Computer science, MSc (Electronics), BSC IT of Mumbai University, even MTech (electronics), MTech(IT) of various Universities.