SN8P2929 is a high-performance 8-bit microcontroller with the 4K-word of the OTP ROM. The SN8P2929 provides the following features: 256 bytes of RAM, one 8-bit basic timer (T0) with RTC function, one 16-bit timer/12-bit capture timer (T1), one 8-bit timers /counters (TC0) , a watchdog timer, 6-sources interrupts (INT0, INT1, T0, TC0, T1, ADC), a in system programming ROM (ISP ROM) function with VPP voltage generation internally for calibration data programming in ROM, a 20-bit ADC, a PGIA, three voltage regulators including AVDDR, AVE+ and VLED module for LED driving, a integrated R and C-Type LCD driver for 4-common x 20 -segments LCD panel and a 8-level stack register. In addition, the SN8P2929 is a dual clock system, i.e. high-speed system clock and low-speed system clock. The high-speed system clock source is generated from internal 4MHz high-speed RC oscillator (IHRC 4MHz). The low-speed system clock can be generated from on-chip low speed RC oscillator circuit (ILRC 32KHz@3.3V) or external 32768Hz crystal@Code Option Setting:IHRC_RTC.