Contents: 1. Basics of 8051 Microcontroller. 2. Instruction set and Programming of 8051. 3. Assembly Language Programming of 8051 Microcontroller. 4. Timers of 8051 Microcontroller. 5. Serial Communication of Microcontroller 8051. 6. Interrupts of 8051 Microcontroller. 7. Memory Interfacing with Microcontroller 8051. 8. Applications of 8051 Microcontroller. 9. Embedded Systems. 10. PIC, 8096 and ARM Microcontrollers. 11.Applications of Single Board Computer. Index. The book first deals with the microcontrollers and then goes on to discuss embedded system design, and finally to the applications of embedded systems. Apart from the most popular 8051 Intel family of MCs, it also discusses the Intel-8096, ARM and PIC suites of microcontrollers. The basic architecture and various makes are detailed in the first part of the book. Both, the interfacing and the software aspects have been given an integrated treatment which is necessary for this subject. It includes 200+ examples, solved in a step-by-step method and with the aid of flowcharts for better understanding. Data used and the results obtained have been appropriately detailed in these examples. Applications of microcontrollers such as LEDs, 7-Segment LEDs, LCDs, Keyboard, Stepper Motor, DC Motor, Servo Motor, Keyboard, ADC and DAC, etc., are simulated with IDE simulation software and Proteus design tools so that the students are exposed to the practical approaches involving designing of small projects. Embedded system applications in a single board computer have been covered separately.