I have some printed circuit boards of a device that is no longer manufactured. I need to repair these boards but there is no replacement for them. I can make other boards, buy the components, but I can not get the firmware, the microcontroller is a STC 89C58RD.
I found a datasheet:
As I could see it can be programmed by serial RS232 interface. I looked for a programmer but I just find this document in chinese(I'm not sure) as following :
I already read and study a bit about JTAG standard and the TAP controller state machine to do a similar job with a Motorola Microcontroller, but I would like to know if someone know this microcontroller STC 89C58RD or has a tip about how to perform this task.