Introduction - If you have any usage issues, please Google them yourself
MCS-51 on the structure and principles of Chapter III of the MCS-51 microcontroller instruction Chapter IV MCS-51 microcontroller programming Chapter V MCS-51 in the sixth Interrupt System Chapter MCS-51 microcontroller serial interface Chapter VII of the MCS-51 microcontroller system expansion Chapter VIII MCS-5 a microcontroller interface and control (in part)