‧ 8-bit real time clock/counter with 8-bit programmable prescaler
‧ On chip Watchdog Timer (WDT) with internal oscillator for reliable operation 
     and soft-ware watch-dog enable/disable control
‧ 2 I/O ports with independent direction control
‧ Soft-ware I/O pull-high/pull-down or open-drain control
‧ 1 internal interrupt source; 2 external interrupt source
‧ Wake-up from SLEEP mode
‧ Built-in 8MHz, 4MHz, 1MHz, and 455KHz internal RC oscillator
 ‧ Operating voltage range: 2.0V to 5.5V

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