I need to transmit only with an Tiny45 but... with an external clock.
I saw some UART articles about Uart with ATTINY. But always the pin 3 is used for TX. And this pin is used for XTAL.
With software serial it seems possible.
I tried at 16Mhz but it doesn't work. Does it works only with 8MHz?? (Unfortunately no 8MHz Xtal in my stock...) :-(
Can anybody confirm that?