I am contemplating using a mega48 in athe sleep or idle mode to save power. RS232 commands will come in & I wish the mega48 to "wake up" and receive them. is this possible from the sleep mode? It seems possible form the idle mode. I'd prefer for the scheme to not miss any commands (thus interpret the first command sent), and avoid having to transmit a "dummy" wakeup command.
I saw several posts using a "dummy" wakeup command, but am wondering if it is easy to wake up merely by sending a byte into the uart.
Any thoughts on this idea are most welcome!