is it possible to use BP as JTAG interface for LPC2148 in circuit debugging. Bcoz i need tool to do this task.
i want to observe the program behavior with hardware.
Which program do you want to use as a debugger? Bus Blaster can be used with OpenOCD but I don't know if you can use other debuggers.
I'd say yes (no guarantee) as the LPC2148 seems to have dedicated jtag pins and seems to be supported by openocd.
I'd look here for more details: http://psas.pdx.edu/OlimexLPC2148Setup/ (http://psas.pdx.edu/OlimexLPC2148Setup/)