On Tue, Feb 23, 2010 at 2:10 PM, Matthew Smith <m...@smiffytech.com> wrote: > BTW: does anyone know if a 0.55V p-t-p sine wave from an Rb source would > be enough to clock an Atmel AVR microcontroller? The crystal/clock > input *is* an amplifier, but didn't know if I'd need to do anything to > the signal first, to get it closer to the 5V logic level.
AVR's define 0.8*Vcc as V[IH1] and 0.1*Vcc as V[IL1], and you can get AVR's rated down to 1.8V. Your 0.55V signal won't work. Source: page 316 and 322 of the ATmega48/88/168/328 datasheet (http://atmel.com/dyn/resources/prod_documents/8271.pdf), likely any other AVR will have these requirements. -- GDB has a 'break' feature; why doesn't it have 'fix' too? _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.