Built-in high-speed on-chip oscillator clock. ? Selectable 64MHz (TYP.), 48MHz (TYP.), 32MHz (TYP.), 24MHz (TYP.), 16MHz (TYP.), 12MHz (TYP.), 8MHz (TYP.), 4MHz (TYP.) or 1MHz (TYP.). Built-in single supply flash memory (with a block erase / program disable function). Support self-programming function (with boot swap function / flash shield window function). On-chip debug function. Built-in power-on reset (POR) circuit and a voltage detection circuit (LVD). Built-in watchdog timer (can be run in a dedicated low-speed on-chip oscillator clock). Multiply and divide and multiply-add operations to support instruction. Built-in key interrupt function. Built-in clock output / buzzer output control circuit. Built decimal correction (BCD) circuit. I / O ports: 28 ~ 58 (N-channel open drain: 3 to 4) parameters of the product, please contact us by phone, thank you!