I am looking to make something fun with the MC6847, an old video display processor from Motorola. I browsed through its datasheet (http://people.ece.cornell.edu/la...) and saw that the requirement on its clock duty cycle to be between 45 to 55%. I think understand what that means. But I have been looking at crystals and oscillators' datasheets (the 3.579535Mhz ones) to find if there is such specification. I am not seeing any.
I could have an ATTINY85, for example, running at 3.579535Mhz, to pulse a 50% duty cycle via PWM as a clock source to the MC6847. Would that work? I also have seen on the net that a simple 3.578535Mhz crystal (not oscillator) is used with an HCT04 logic IC to provide a clock input for the MC6847. I much rather use an ATTINY85 or the Atmel uC that I am going to use with CKOUT of the desired Mhz, for example, as a clock provider.
I guess typically a square wave for a clock is at 50% duty anyway.
Thanks for any tip / suggestion.