?8-bit real time clock/counter (Timer0) 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 (maximum 16 I/O pins)
?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