短接PB22时可以直接使用USB或者串口升级CH573，请问一些这个内置bootloader是固化在芯片独立的flash空间吗？

还是这个出厂内置usb升级程序 就放在数据手册上的 0x78000~0x7DFFF 系统引导程序存储区Bootloader   24kB

我这边自行开发的 bootloader是否也可以放到这个24kB区域内？会不会影响 内置的出厂的usb升级功能

对是的，bootloader就在手册中的这个区域，这个区域用户是没操作权限的。

Hello!

I am learning ch573/ch571 and I don't understand how to use it. So several questions:

1) How to force bootloader start?

2) Is it true that bootloader is preinstalled and user can't change it?

3) what is bootloader protocol? Are there any description of that protocol?

4) Are there some software for host pc running GNU/Linux that can neogotiate with bootloader and upload fw?

1. During power-on,PB22 pin is pulled down.

2. YES.

3. I'm sorry,we don't have an open protocol.

4. Email zhangj@wch.cn to obtain it.