SP300 Programmer Reverse engineering

[Palmitoxico]

So, I've acquired an chinese SP300 programmer in 2013 for programming some classic Atmel 8051 microcontrollers. It worked great for that purpose, but the manufacturer dropped support for this programmer on the last versions of their software, so I've decided to try to reverse engineering the hardware and possibly the software to add some EEPROMs and FLASH memories that I have lay around here on the list of supported devices.

I also pretend to write some replacement for their software that runs on Linux/*BSD.

This programmer uses and PL2303HX chip (fake) as an Serial to USB interface that connects to an unknown microcontroller (they scratched the numbers as always). The microcontroller uses a 48 pin LQFP package.

For while I've mapped these pins of the microcontroller (I'll update this list as I discover more):

Code: [Select]

Pin number	Function
1	
2	
3	
4	
5	
6		RX
7	
8		TX
9	
10	
11	
12	
13	
14	
15		XTAL1
16		XTAL2
17		GND
18	
19	
20	
21	
22	
23	
24	
25	
26	
27	
28	
29	
30	
31	
32	
33	
34	
35	
36	
37	
38	
39	
40	
41		VCC
42	
43	
44	
45	
46	
47	
48	

Please let me know if you have a guess for the microcontroller tha this thing uses.

I've attached some photos of the programmer.

[amyk]

STC12C5A60S2

[Palmitoxico]

STC12C5A60S2

Ow, I can't thank you enough!

I'll update this thread as I progress.