How stable is the 555 as an oscillator?
What I'm looking at is something that will give me a 5V / 12.5kHz square wave (as in 50% duty cycle).
I'm looking at having to redo my project from the bottom up, and one of the things that will likely have to go away is the MC6840 timer IC. Two of its channels are strictly software timers (which I could just as well recreate in code), the only one with a physical output is a 'set and forget' deal which generates a square wave, and I think a 555 should do just fine (my other option would be a Schmitt trigger oscillator).
What I'm looking at is something that will give me a 5V / 12.5kHz square wave (as in 50% duty cycle).
I'm looking at having to redo my project from the bottom up, and one of the things that will likely have to go away is the MC6840 timer IC. Two of its channels are strictly software timers (which I could just as well recreate in code), the only one with a physical output is a 'set and forget' deal which generates a square wave, and I think a 555 should do just fine (my other option would be a Schmitt trigger oscillator).