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LPC2194 & LPC2294 JTAG ports

2004-11-15 by gregdeuerling

Hi,

I'm trying to work out a problem I'm having programming a LPC2194.  
I've posted a question on this already here.  See:

http://groups.yahoo.com/group/lpc2000/message/4049

I was looking in the LPC22194 & LPC2294 datasheets and I saw that 
the JTAG pins (P1.26-P1.31) PINSEL register was set to P1.26/RTCK at 
reset.  The LPC2194 datasheet says the JTAG's PINSEL register is set 
to '0' on reset.

Does the JTAG PINSEL register on the LPC2194 need to be set to '1' 
for me to program the LPC2194 via JTAG?

The datasheet says the PINSEL is set to '0' at reset, this seems 
wrong to me.  Seems it should be the same as the LPC2294.  That way 
it always comes up with the debug port enabled.

I was setting the PINSE2 register to 0x00000000 after my program was 
up and running because I need to use some of the TRACESYNC pins as 
IO.  If I put in a new LPC2194, take out the setting PINSEL2 to 
0x0000000, will the JTAG work?  I'll try this later and see if it 
works.  I just hate to pull any more LPC2194's off of the PCB...

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