Lpc2000

Hi All,
   
  I am facing a  reset problem in LPC2214. The problem is limited to improper operation of SPI peripheral, when using a RC reset or a supervisory IC TPS3125J18. But, if i use a simple reset switch arrangement, which shorts the Reset pin to ground momentarily and then pulling the Reset pin high through a resistor of 10k then, the SPI operation seems to work properly.
  As we are developing a commercial application, this type of reset switch operation would not be desirable. 
  I am unable to understand, why only the SPI should malfunction. If at all there is a reset problem, then why should there be no problem in the functioning of the other peripherals. And also, why should the problem be resolved by the provision of a reset s/w.
   
  I hope some one can guide me in this respect.
   
   
  Regards,
  Jerome
   
   
   
   

				
---------------------------------
 Jiyo cricket on Yahoo! India cricket

[Non-text portions of this message have been removed]

Jerome,

please check pin 0.31, description in the manual, search for it in
this forum.  By the way, I am serious, I remember something about 0.31
and JTAG and SPI, there was a connection but I can't recall what it
was. I think if 0.31 is sampled with the "wrong" polarity at reset,
the JTAG pins and SPI pins are somehow altered.

Hope this helps, Bob


--- In lpc2000@yahoogroups.com, jk jlkj <njad2002@y...> wrote:
>
> Hi All,
>    
>   I am facing a  reset problem in LPC2214. The problem is limited to
improper operation of SPI peripheral, when using a RC reset or a
supervisory IC TPS3125J18. But, if i use a simple reset switch
arrangement, which shorts the Reset pin to ground momentarily and then
pulling the Reset pin high through a resistor of 10k then, the SPI
operation seems to work properly.
>   As we are developing a commercial application, this type of reset
switch operation would not be desirable. 
>   I am unable to understand, why only the SPI should malfunction. If
at all there is a reset problem, then why should there be no problem
in the functioning of the other peripherals. And also, why should the
problem be resolved by the provision of a reset s/w.

>    
>   I hope some one can guide me in this respect.
>    
>    
>   Regards,
>   Jerome
>    
>    
>    
>    
> 
> 				
> ---------------------------------
>  Jiyo cricket on Yahoo! India cricket
> 
> [Non-text portions of this message have been removed]
>