I asked this question once before in a slightly modified manner and never received a response so I thought I would try again. I have two PIC processors running at different speeds. One is running at 8MHz using the internal clock and another is running at 40MHz (via PLL). My question is if I use the faster PIC as the master can I reliably send data to the slower as long as I don't exceed the slower processors processing capability. I have built a simple test circuit that appears to work, but I want to make sure that it is "within spec." I cannot find reference to this in any data sheet or other document. I need to make sure this would be reliable in the real world. Any thoughts? -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist