Xiaofan Chen wrote: > I am not using IrDA and I can not afford the space and current consumption > of dsPICs. I need a small MCU (perhaps 4x4mm) and it should consume > less than 5mA at the internal oscillator frequency. I've found some Silicon > Labs parts which fit the requirement (C8051F33x/35x). With C8051F330 you'll need to implement some custom high speed opto protocol in software. It's not easy, as for me. It would be better to get MCU with built in IRDA hardware, like MSP430F2234 or some of Renessas MCUs. Regards, MS -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist