Tag Archives: clock

6502: more fun with clocks

      No Comments on 6502: more fun with clocks

Things can get a little confusing with the 6502 microprocessor’s clocks. The datasheet details three clock pins which, for the current version of the chip are PHI2, PHI2O and PHI1O. And with older versions of the 6502 you’ll see PHI1 instead of PHI2. As I detailed in a previous post, the situation is actually simpler that it first seems. It… Read more »

Zolatron 6502 homebrew computer – clocking in

Sometimes the things that confuse you most turn out to have the simplest solutions – and so it was with the clock for my Zolatron 6502 homebrew computer. First, let’s deal with the 6502’s clock pins. There are three of them and they’re called PHI1O, PHI2 and PHI2O – except when they’re not. Older versions of the 6502 have PHI1… Read more »

AVR basics: using the I2C bus #1 – bit rate

Part 1 – bit rate Part 2 – transmitting Part 3 – sending data Part 4 – receiving data Part 5 – final thoughts When I first started playing around with Arduinos I quickly grew to like the I2C bus, and for a couple of good reasons. First, it was easy to use. And second, there are lots of fascinating… Read more »