Hi,
I am looking for a low power microcontroller which will be battery powered.
It needs one or two SPIs plus a UART. Essentially I would like it to sleep on the lowest power consumption possible and wake on UART rx. I have been working on the microchip xlp, but its a pain to get it to wake on uart (can connect rx to an int line but this misses the first byte or put it into idle instead of sleep, but this runs at 4.6mA which is way too high).
Anyone any suggestions?
Many Thanks,
DumbMonkey.

 

You should easily be down to a handful of μa's in sleep. Which xlp device are you using? By enabling the PIE for the uart the INT pin connection is unnecessary.

What is the data rate of the uart?, and what type and speed of oscillator is being used?

Edit: Also what is the battery voltage being used?

 

Checkout the MSP 430 from Texas Instruments

 

Nickelflipper, I didnt realise that was possible, most of the info was from websites from others with the same issue. I will try enabling the PIE.
Much Appreciated,
DumbMonkey.

Papabravo, I will have a look at that mc too.
Thanks also.

 

Try Silicon Labs C8051F930. I have built a simple air cond controller (emulating the IR signal) using it and it has been running on the same set of batteries (1.5v x 2) for the last 2 years.