Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Start/Stop and Forward/Reverse can be controlled with almost any microcontroller with a few general purpose I/Os + zero-crossing opto-isolators + Triacs (or something like that) ..
Speed control (for example, zero-speed at full torque) is totally different kettle of fish and the 89S52 is just not the right choice for this job ..