the sn8p2722 is a risc-like high performance and low power consumption 8-bit micro-controller. the device is designed with the excellent ic structure including the program memory up to 2k-word otp rom, data memory of 128 bytes ram, two 8-bit timer counters (t0, tc0), a watchdog timer, four interrupt sources (t0, tc0, adc, int0), one channel pwm output (pwm0), one channel buzzer output (2k / 4k), 5-channel 12-bit adc converter, and 8-level stack buffers. there are four oscillator configurations to select for generating system clock, including external high/low speed crystal, ceramic resonator or internal cost-saving rc, an internal 16mhz rc oscillator for system clock and includes an internal low frequency rc oscillator for slow mode controlled by programming.