Hello, I am using PK-ARM keil product and Philips LPC2129 for my application. I have set all registers according to my application and now my task is to write a program in pk-Arm and burn the flash in LPC2129. I would like to know that how can I know by giving ADCR |= 0x01000000 will start A/D conversion and ADCR &= 0x01000000 stop A/D conversion. In gernal I am asking why '|' or '&' these symbols. I am also sreaching for user manual for programming applications in pk-arm where by I can learn and do my programs. I have sreach 'help' in pk-arm but it only shows examples programs but not user manual. Pk-Arm has user manual but it is to learn how to set and start the evaluation board . I would appreciate if anyone would help me getting me know these terms so I can better write programs for my applications. With Regards, Sridhar