Hi everyone, I am part of a development project of an ASIC MCU with 8051 IP core. The ASIC has no UART interface neither port P0 for external MEM. Instead it has some general IO ports and a 3 wires interface (something like SPI). I am considering to use the MONITOR program FlashMON51 or ISD51 from Keil for debug purposes in the future for this ASIC chip. Both monitor programs (and usually all the other monitors for 8051 I have found on the internet) uses the UART interface. My questions are: 1. Does anyone know wether is it possible to configure FlashMON51 or ISD51 monitor for an SPI interface? Can anybody give me a clue how to do it? 2. Can you suggest me what other debug possibility for an ASIC do I have together with the Keil uVision IDE? Thanx a lot for the answers greetings Attila