Description: The AT89C5124JC is an 8-bit microcontroller from Atmel Corporation. It is based on the 8051 core and is designed for low-power applications.

Features:

8051 core with a maximum clock frequency of 24 MHz
4K bytes of on-chip Flash program memory
256 bytes of on-chip RAM
32 I/O lines
8-channel 10-bit A/D converter
2-channel UART
SPI and I2C interfaces
Watchdog timer
Power-saving sleep mode
Operating voltage range of 2.7V to 5.5V

Applications:

Automotive
Consumer electronics
Industrial control
Medical devices
Security systems(For reference only)
https://www.utsource.net/itm/p/104244.html