> > That may take a lot to get that idea to work. Lots of variation in > > that process. > > If I did the following: > > 1. Got away from the xtal, and stayed with the reduced clock > usually available on pin 20 or 22 of the eprom, > > 2. got away from powerup and just used watchdog resets
Well, actually, you can't get away from power-up reset when you turn the power on. Because many micros have dynamic cells inside instead of static. The charge pump for biasing them has to start operating and the cells have to be initialized. When you first turn the power on, you're dealing with the Analog part of the digital device. > Then I would have a high on the reduced cpu clock ( 'E' or pin > 64 on the HD6303XP & HD6303YP) until the xtal was set going. The time > between end of reset and first clock cycle would be immaterial. The > start of my scan would be the start of the first read cycle. > > What I really wanted to avoid was having to stick a clip on the eprom > and trap an opening read at a low address to get the start signal, and > processing also to get a stop. That's the only reliable way that I can think of to do it. That first read is the signal that says the processor is up and running. ?? -- Author: Dave Baldwin INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
