Lpc2000

I am asking mainly just about LPC213x and LPC214x series.
Realy they have too few pins for such a powerful processor.
So each pin is a very valuable resource and it is pity to
lost it only for debug purposes.
By the way I would be happy to see a 100-pin version of this
series with more IO pins, especially with PWM not shared with interfaces.
Anyway, I am still waiting for discussion about P1.24-P1.31
pins usage.

Varuzhan 

--- In lpc2000@yahoogroups.com, "seangra" <embeddedrelated@w...> wrote:
>
> 
> What about for the LPC213x and LPC214x series?  I think they only 
> have 1 JTAG port, right?
> 
> --- In lpc2000@yahoogroups.com, Tom Walsh <tom@o...> wrote:
> >
> > varuzhandanielyan wrote:
> > 
> > >Maybe very silly question, but...
> > >Can I use P1.24-P1.31 pins in my design as
> > >IO, if I plan to debug the soft using JTAG,
> > >particularly ULINK.
> > >Technical data references, experience, opinions?
> > >
> > >  
> > >
> > I do.  The LPC2106 has a secondary JTAG port, you just need to 
> turn it 
> > on..   You must download the first Flash image without JTAG, but 
> after 
> > that it works fine: flash new program, debug, etc.
> > 
> > This is the code sequence in the first few bytes of my crt0.S:
> > 
> > ================ begin ====================
> > _start:
> > start:
> > _mainCRTStartup:
> > 
> > // Initialize Interrupt System
> > // - Set stack location for each mode
> > // - Leave in System Mode with Interrupts Disabled
> > // -----------------------------------------------
> > ;
> >       ldr   r0, JTAG2
> >       ldr   r1, PINSELREG
> >       str   r0, [r1]       // activate secondary JTAG port.
> > ;
> >       mov   r3, #65536
> > startdelay:
> >       subs  r3, r3, #1
> >       bne   startdelay     // give debugger time to catch us.
> > ;
> > 
> > =============== snip ======================
> > 
> > With JTAG2 & PINSELREG as:
> > 
> > ================= begin ===================
> > JTAG2:
> >    .word 0x55400000
> > PINSELREG:
> >    .word 0xe002c004
> > ================== snip ===================
> > 
> > 
> > The short delay loop lets the JTAG unit "catch up" and stop the 
> > processor early in the boot process.  Otherwise, I've run into 
> problems 
> > where the processor will run into a brick wall (bad code) before 
> the 
> > JTAG can catch it out of reset.
> > 
> > 
> > TomW
> > 
> > 
> > -- 
> > Tom Walsh - WN3L - Embedded Systems Consultant
> > http://openhardware.net, http://cyberiansoftware.com
> > "Windows? No thanks, I have work to do..."
> > ----------------------------------------------------
> >
>