CMS8F003 is an 8051 chip, with a system clock up to 16MHz, featuring UART, SPI, I²C, and an internal high-precision 12-bit ADC.

>  8051

>  Operating voltage: 2.0V-5.5V@16MHz/2T

>  Operating temperature: -40℃-85℃

>  8K x 8Bit Flash

>  256 x 8Bit RAM + 256 x 8Bit XRAM

>  128 x 16Bit EEPROM

>  One 8-bit timer + one 16-bit timer

>  One UART + one SPI + one I²C

>  Internal 12-bit high-precision ADC with internal reference voltage, 18 external channels

>  5-channel PWM module, with 2 groups of complementary outputs

>  18 GPIO pins

>  Package types: TSSOP20, QFN20