CH552KCS

 20221019.3


These two sites are useful:

[沁恒单片机系列]一、Keil中添加沁恒单片机型号_Magnin的博客-CSDN博客

CH551、CH552、CH554 、CH558、CH559下载步骤_zfysis的博客-CSDN博客_ch554


20221021.5

I came across the 6800 in the early 1980s. But the ROMless Intel 8031 was the first microcontroller I tried to develop. Using a large breadboard, I used an UV-EPROM to make the 8031 running endlessly. Then using the asynchronous RS232 port, I arranged for a program, written in assembly language, to be downloaded into a RAM chip and executed by the 8031.

Othe microcontrollers and microprocessors were similarly tested without using the costly emulator. The set up was most simple with the MC68HC811E2, which was used in some student projects. That was long ago. It seems the RS232 is making a come-back, even though the USB has removed the physical RS232 port.

Here comes the CH552, an 8031 with the USB, and the SPI replacing the old shift register.






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