I meet a question: I want to make a hardware emulator do to some experiment with mcs-51 microcomputer!But i am not very clear understand the thoery of the emulator! I use a device with 64k FALSH ROM on-chip.it can well connect with the keil debugger!but i don't know where my application code stores! thank you for your help first!
"Does the chip have JTAG hardware?" Note that JTAG is just the interface; you need both the JTAG interface and the on-chip Debug hardware ro give you the "built-in ICE" (Some chips - eg, some uPSDs - have a JTAG interface just for flash-programming but with no on-chip debug)
Andy, I'm plenty familiar with that. I designed-in a uPSD3254 processor to my latest project JUST before they released the uPSD33XX series with boundary scan functionality. As such, I had to go the more expensive ICE route. It's my understanding that the majority of chips that include a JTAG interface also include the on-chip debug functionality, though. Is that generally the case?
"It's my understanding that the majority of chips that include a JTAG interface also include the on-chip debug functionality, though. Is that generally the case?" I think so. But, as you obviously know, it ain't necessarily so...! Some chips have JTAG but no on-chip debug (eg, the uPSDs mentioned earlier); some chips have on-chip debug, but no JTAG (they use some other proprietary interface).
I guess that you are designing an 8051 device. You may use either the ISD51 or FlashMonitor within your device. Another way is that you build a debugger peripheral on silicon and then use the AGDI interface(http://www.keil.com/appnotes/docs/apnt_145.asp) to connect it with the uVision Debugger.