I love the PIC16F505 chip. I've used it successfully in many designs. Careful to not count 12 Output lines, it only has 11 I/O and 1 Input only. The other sad thing I remember (please correct me if I'm wrong) is the internal oscillator is only 4Mhz. To get 20Mhz operation, you must use an external oscillator. I don't like the VCC pin 1, Gnd pin 14 either.
J. >An outside of the box idea is a PIC 16F505 has an internal osc, 14 pin DIP >with 12 usable I/O lines and you only need 11 of them. And its about half the >cost around 75 cents in bulk. So program it, slap the power leads on, and it >does its thing. True, a GAL can process I/O ten million times faster than the eye can perceive, whereas the PIC running a tight loop and simple table lookup might only be able to process a hundred thousand times faster than the eye can perceive. Fast enough for human I/O devices, although not for memory decoding. Something I dislike about Microchip is they never hook up GND to pin 7. If they did, you could program up a couple of their processors to emulate many TTL logic chip at up to "hundreds of KHz" speeds just by loading a simple program into the PIC. I need a 7400. No wait I need a 7402, I'll just reprogram it. That doesn't work because Microchip always wires GND to pin 1 or something inconvenient like that. Doesn't matter for a new design, only if you're trying to make a "7447 replacement" (other than that being a 16 pin, obviously) -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out. -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
