I am looking for a microcontroller with UART that will run at 1Mhz normally and 8Mhz when more power is available. My problem is the receive on the RS232 when changing the processor clock speed. I think this will cause an upset in any receive characters coming in at the change over. Has any body got any ideas for a low power processor (0.5mA at 1MHz) that can change processor clock speed without upsetting the receive side of the RS232.
Thanks