I'm trying to get JTAG connection to the processor mpc8280 with USB TAP.
1) I choose debug mode in codewarrior, but it always gives the message "mpc603ei：cannot put the target into STOP mode". While in this case, after giving power supply before debugging , the current of the circuit board is unstable, it'll rise to a certain value and fall down to a stable value.
2) Yesterday a new problem arose. That is, the current gets stable, but the message changed into “writereg error:writereg MBAR 0xf0000000 failed”. And if I debug again without removing the power supply, the program will stop at "__flush_cache" before entering the main function.
3) Sometimes the error will be "no connection to the target or unrecognized processor".
Can you give me some guidance in interpreting these errors ?
Thanks and Regards,