Iam connecting microcontroller 8051 with my PC COM1 port to have serial communication. To have same voltage levels between PC and 8051 i have used MAX232 but i need to know what other components like capacitors and resistor i need to connect in between controller and MAX232. i have the data sheet but information is limited. so can any one suggest capacitor value and quanity and other minor components.
please can you send me a typical design dealing with the interficing of the 8051 cpu and the the max232 exuse me for my bad english greeting
"please can you send me a typical design dealing with the interficing of the 8051 cpu and the the max232" Just look on p17 of the MAX232 Data Sheet - the 8051 connects to the signals labelled "CMOS Inputs" and "CMOS Outputs" The Keil MCBx51 Evaluation Board uses a MAX232 - the schematic is in the MCBx51 User's Guide: http://www.keil.com/manuals/mcbx51.pdf There is example code in the downloads section of this site for doing interrupt-driven serial IO.