AT89C5 1 produced by Atmel company. Stc 12c5a60s2 is produced by Hongjing Company.

2.RAM and ROM are different.

AT89C5 1 Yes 128 bytes of RAM, 4K ROM；; ; Stc 12c5a60s2 is a 256-byte 8K ROM.

3. The number of timers is different.

AT89C5 1 has two 16-bit timers: T0 and T 1. STC89C52 has three 16-bit timers: T0, T 1 and T2.

Extended data:

Basic Introduction of at89c5 1 Single Chip Microcomputer

The erasable read-only memory of single chip microcomputer can be erased 1000 times. The device adopts atmel high-density nonvolatile memory manufacturing technology and is compatible with the industrial standard mcs-5 1 instruction set and output pins. ATMEL's AT89C5 1 is an efficient microcontroller. AT89C05 1 is a simplified version of AT89C05 1, which integrates multifunctional 8-bit CPU and flash memory on one chip. AT89C5 1 MCU provides a flexible and cheap scheme for many embedded control systems.

For example, the 80C5 1 single chip microcomputer is both universal and bus-based, and can also be used for industrial control.

Baidu Encyclopedia -AT89C5 1