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I used the ULINK JTAG debugger to debug Keil MCB2130 board for some 
days. They worked well. But when I touched two I/O pins to 5.5V 
carelessly, these two I/O pins damaged. The LPC2138 also can work by 
downloading firmware from ISP. But from that time, the ULINK can't be 
detected by Keil uVision software. I want to know if it is possible for 
ULINK to be damaged, or ULINK JTAG can not be detected just because the 
CPU device has bad I/O? Please give me some ideas, I really appreciate 
it.
	

(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Hi all,
   
  Can someone give me a help? thanks!
	beiyong2003 <beiyong2003@beiy...> wrote:
  I used the ULINK JTAG debugger to debug Keil MCB2130 board for some 
days. They worked well. But when I touched two I/O pins to 5.5V 
carelessly, these two I/O pins damaged. The LPC2138 also can work by 
downloading firmware from ISP. But from that time, the ULINK can't be 
detected by Keil uVision software. I want to know if it is possible for 
ULINK to be damaged, or ULINK JTAG can not be detected just because the 
CPU device has bad I/O? Please give me some ideas, I really appreciate 
it.
	---------------------------------
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[Non-text portions of this message have been removed]
	

(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )

Hello qq qq
You can enable/disable the JTAG test pins via the PINSEL2 register. If 
your software overwrites the content of this register, it can happen, 
that the JTAG port is accidentially disabled. Look at the LPC2138's 
user's manual for the correct pin settings.

Karsten

qq qq schrieb:

>Hi all,
>   
>  Can someone give me a help? thanks!
>  
>
>beiyong2003 <beiyong2003@beiy...> wrote:
>  I used the ULINK JTAG debugger to debug Keil MCB2130 board for some 
>days. They worked well. But when I touched two I/O pins to 5.5V 
>carelessly, these two I/O pins damaged. The LPC2138 also can work by 
>downloading firmware from ISP. But from that time, the ULINK can't be 
>detected by Keil uVision software. I want to know if it is possible for 
>ULINK to be damaged, or ULINK JTAG can not be detected just because the 
>CPU device has bad I/O? Please give me some ideas, I really appreciate 
>it. 
>
>
>
>
>    
>---------------------------------
>  YAHOO! GROUPS LINKS 
>
>    
>     
>
>    
>---------------------------------
>  
>
>
>
>		
>---------------------------------
>Blab-away for as little as 1¢/min. Make  PC-to-Phone Calls using Yahoo! Messenger with
Voice.
>
>[Non-text portions of this message have been removed]
>
>
>
> 
>Yahoo! Groups Links
>
>
>
> 
>
>
>
>
>  
>
	

(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )