operating voltage range: 1.8~5.5v l operating temperature range: -40℃~+85℃ l typical current consumption n active：150ua/mhz n standby：15ua@32khz n sleep w/ lcd on：<10ua n deepsleep w/ rtc & 16kb ram：1ua n deepsleep w/o rtc：0.5ua l low power mode fast wake-up n sleep mode wake-up time: <20us n deepsleep mode wake-up time: <50us l arm cortex-m0+ n frequency up to 40mhz n memory protection unit n unprivileged/priviledged mode n nvic n swd debug interface l flash memory n up to 512k bytes program space n endurance 20,000cycles n data retention >10yrs（@85℃） n bootloader self-progamming supported n code protection mechanism