Lpc2000

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.