Lpc2000

Has anyone on this forum used the secondary JTAG port on the LPC2106
with success?

Thanks,

James Dabbs, TGA

Hi James,

We did some testing with this and it seemed to work and we know that
some of our customers are using it. I would agree that the
primary/secondary JTAG scheme is a bit odd - but I'm sure Philips had
their reasons for it. 

Both JTAG schemes on the LPC21xx suffer the same drawback that the
devices cannot be brought out of reset under debug control. Consequently
there is a window of opportunity before the debugger gets control of the
device that the application can execute. 

We have found that putting the LPC into low power mode will kill the
JTAG port. So we know of one way in which a program can be flashed into
the LPC that will render JTAG debugging useless - perhaps you have found
another way to do this?

Regards
Michael

Has anyone on this forum used the secondary JTAG port on the LPC2106
with success?

Thanks,

James Dabbs, TGA