dear sir; i want to control a micro(89c55wd) for power down mode from program. please advise me.
There is a power down bit in the PCON register. All you have to do is set that bit and the chip goes into power down mode. There is an Idle Mode example at: http://www.keil.com/download/docs/8051fx_idle.zip.asp That should give you an idea of what to do. Jon