Lpc2000

Yes, disable ALL interrupts when writing the AA and 55 then re-enable them.
  -----Original Message-----
  From: extra300_it [mailto:roberto.labaa@...]
  Sent: Thursday, February 03, 2005 9:50 AM
  To: lpc2000@yahoogroups.com
  Subject: [lpc2000] WDT feed



  Hello,
  One question about WDT feeding.

  The user manual is (once more) not exatcly clear about WDT refresh.
  It says that after writing 0xAA to WDTFEED, 'the next operation in
  watchdog register space should be a write 0x55 to WDTFEED', otherwise
  the watchdog will reset the cpu even if the timer is not yet elapsed.

  What happens if one interrupt triggers between 0xAA and 0x55?

  I see the wdt resets cpu, even if the ISR does not affect WDT
  register space.

  Do I need to disable interrupts before feeding WDT?

  Thank you.







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