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Re: [lpc2000] Re-programming device with CRP via JTAG ?

2006-04-26 by Herbert Demmel

Dominic,

sh... this are bad news :-(
Anyway, thank you for the info, Dominic.

Regards
Herbert

At 09:18 26.04.2006 +0200, you wrote:
>No, there is no such way. If the bootloader finds the value 0x87654321 at
>address 0x1fc, it leaves the JTAG pins configured as GPIO, and they can't be
>used for JTAG.
>
>Regards,
>
>Dominic
>
>On Wednesday 26 April 2006 09:14, Herbert Demmel wrote:
> > Hi guys,
> >
> > as I could not find the appropriate information in the manual I ask this
> > question to the community:
> >
> > If I have a (e.g.) LPC2148 device with CRP (0x1FC set to 0x8765 4321), it
> > is still possible to re-program the device by completely erasing it before
> > re-programming it via the serial port, I assume.
> >
> > But: If the device has CRP, the JTAG port is disabled as per spec, so it
> > seems to be impossible to re-program the device via JTAG port.
> >
> > Please tell me if I'm right with my assumption or if there is some work
> > around to erase/re-program a device via the JTAG pins only when CRP is set.
> >
> > Regards
> > Herbert
>
>
>
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