Can any 8051-based devices be debugged via the USB interface rather than via the serial port? Alterrnatively, are there any 8051 devices that have a JTAG interface that is supported by Keil?
Thanks for the info re. JTAG. More specifically, with regards to USB I was hoping that I could use a device with an on-chip USB (there are plenty of them, Atmel & Philips for example) and use a direct USB connection to the PC for debugging (no dongle). After all, the Atmel devices can be flash programmed directly via USB using FLIP. OK, so why would I use a device with USB if I did'n want to use the USB in the application, but can't because I'm "wasting it on debugging"? I'm just weighing up my options.
is that, if a device were to have "'direct USB debugging", the USB would have to be "hard coded" in the chip. I doubt such a chip would sell very well.
Erik
....unless it had a variant of Flashmon (or something similar) installed using FLIP that would configure the USB appropriately. Maybe this is a project for one of my students.....
how would you load it? if you have to find a means of loading it (in ISP mode) why not use the same means to debug?