On Sat, 4 Jul 2009 09:43:55 +0200 (MET DST) [email protected] (Joerg Wunsch) wrote:
> You're perhaps confusing that with debugWIRE. As debugWIRE is a > one-wire protocol, it has to live with delays, caused by RC time > constants of the circuitry. Hmmm nope. We were very much discussing JTAG as this what I was curious/interested about back then. However it was a long time ago so I don't remember the details of the discussion... I do remember that I was enquiring about debugging and also chaining. Maybe these use cases do have some little delays that programming doesn't ? Anyway... > ISP is basically the SPI engine of the controller, running in slave > mode. Ah ok, didn't know that.. assumed the ISP controller was something complex enough to require a dedicated circuitry... > As long as you've got JTAG-capable controllers, sure. However, once > you're using a smaller controller that only offers ISP, you have to > use that. > > Even though debugWIRE has its deficiencies (that are mostly due to its > 1-wire bus technology), once you're faced with it, it's still much > better than not being able to debug at all. Well sure, if the part has no JTAG, I will have to do with whatever is available on the chip ! ;-) -- Vince _______________________________________________ AVR-chat mailing list [email protected] http://lists.nongnu.org/mailman/listinfo/avr-chat
