The Time Interval Counter （TIC） can be used to time longer intervals than the standard 8052 timers are capable of. It can be used to interrupt or ‘wake up’ the ADuC831 after a specific interval has elapsed. There are five ways of terminating power down mode on the ADuC831. Three of these ways namely， TIC interrupt， I2C/SPI interrupt or INTO interrupt resume code execution at the point where it was powered down. Issue： When the TIC is activate （i.e. TIMECON.1 = 1）during power down a ‘wake up’ interrupt from any source may trigger a full Power-On-Reset event instead of resuming code execution at the point where it was powered down. This results in all SFRs being reset to their default values. Work-Around ： A bit can be set in dataflash prior to powerdown. By monitoring this bit at the start of code execution the user can determine if the reset was due to a ‘wake up’ from powerdown.
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