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LPC2368 device not recognise by JTAG, PLL value to big

Hi,

Does any one know how to reprogram device (LPC2368) that previously has been programmed with PLL multiplier = 20 and crystal freq 12MHz.

I am using JTAG Keil-Ulink2, and Realview MDK-ARM Version: 3.20.

The background:
I develop board using LPC2368, and the program run with no problem, then accidently, I set PLL configuration Register, PLL Multiplier selection = 20, compiled and download to device.

I realiased make a mistake, then change PLL configuration Register, PLL Multiplier selection = 12 (back previous setting), but when I try to download, the message: 'No JTAG device Found'.

thanks

0 ImPer Westermark over 16 years ago

Switch to the monitor available on com0 and use FlashMagic to erase the chip. This monitor is using the built-in RC oscillator, so it isn't affected by the PLL configuration. You activate the monitor by keeping the /EINT0 signal low when the chip leaves reset.

Possibly, you may also be able to use the JTAG interface by keeping the /EINT0 signal low when trying the JTAG communication.
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0 Rudy Moniaga over 16 years ago in reply to ImPer Westermark

hi Per Westermark,

thank you very much. It works.

I did, connect pin 53 (EINT0) to ground and program the chip using ULINK2.

best regards,
Rudy
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