On 24/7/03 13:47, "Spehro Pefhany" wrote: > At 01:19 PM 7/24/2003 -0400, you wrote: >> SO the SPI clock provide input to a 555 timer, and the timer output is >> governed by this? > > Each negative-going edge is pulse-stretched to 50-100msec in order to > make a visible LED blink. That way you don't miss a transfer that might only > take a microsecond or two. Nice approach. > To see the whole thing you'll need to look at /CS for the device as well > as SDI/SDO (probably with a pullup on the tristate SDO). Logic analyzer > territory. I should have mentioned that I only have one SPI slave device and /CS isn't used. -marc -------------------------------------------------- Marc Nicholas Geekythings Inc. C/416.543.4896 UNIX, Database, Security and Networking Consulting -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body