program execution stops - dies.

Running code which has a repeating set of interrupt service routines for a timer and ADC. Program will execute for a minute or so and then freezes up or does not execute interrupts. Program toggles an output pin to show when interrupts are accessed.

MCU clock frequency is 5.6MHz. I reduced the MAX JTAG Clock down to 50KHz based on the following Keil support doc.

http://www.keil.com/support/docs/2935.htm

Also tried the other options listed in the above support doc.

System and hardware

uVision3 V3.05
ULINK USB-JTAG
jumper set to VCC/ext - correct.
ADuC7020 Eval Board

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