... support for several serial protocols ·IEEE 802.15.4 MAC timer, general-purpose timers (One 16-Bit, Two 8-Bit) ·32 ... -kHz sleep timer with capture ·Watchdog timer ·21 general-purpose I/O pins (19× 4 mA ... ms Wake-Up): 0.2 mA ·Power Mode 2 (Sleep Timer Running): 1 mA ·Power Mode 3 (External Interrupts): 0.4 ...