Lpc2000

Read this post about the RTCK if you want second and subsequent
flashing via the secondary JTAG port.

http://groups.yahoo.com/group/lpc2000/message/1067


--- In lpc2000@yahoogroups.com, "James Dabbs" <jdabbs@t...> wrote:
> OK.  I am no convinced that this answer is NO.  I am now bringing 
the
> secondary JTAG pins out to the debug header, instead of the primary 
JTAG
> pins.  In my system, this seems to imply the following important
> considerations:
> 
> 1. I cannot image an unprogrammed part through my JTAG connector.  I
> will have to do this through the serial port.
> 
> 2. I need to leave DBGSEL unconnected or pull it low at all times.
> 
> 3. I will have to put something in my code to select the secondary 
JTAG
> pins in the PINSEL1 register EARLY in the boot process.  Once these
> instructions have executed, my JTAG debugger will be able to 
communicate
> with the chip.
> 
> 4. If I push the reset button, I'll lose debug control of the chip 
until
> #3 executes.  I.e., I won't be able to single step through the reset
> vector, etc.
> 
> Is there anything else I need to think about?
> 
> Thanks.