I need to reverse-engineer a UART serial protocol on a 68-pin MC68HC11F1 (PLCC socket).
Just confirming that this part will allow me to “clip on” probes so I can run it through my Saleae Logic Pro 8 for analysis: 5401 Pomona Electronics | Test and Measurement | DigiKey
It appears so - please advise!
(I emailed Pomona tech support and they responded with “hopefully” lol)
Hello David,
Thank you for posting on our forum and welcome to our community.
The series part number MC68HC11F1 is in is obsolete.
I am sorry to inform you that I could not find a good cross.
Nathan,
I don’t want to replace the MC68HC11F1 - I need to reverse engineer the serial protocol it uses so I can create a new PCB with newer technology (but maintains the protocol for compatibility).
I just want to make sure that the Ponoma clip will securely fit on top of this PLCC socket - it’s already in my cart 
Thanks!
After doing some research it appears it’s just for surface mounted chips (not socketed). Here is a picture of the underside - it will not work so I’m just going to trace the UART pins and tap them in another location.
Hi @lightCoreSystems ,
68HC11F1 seems to use external memory for program code. The easiest way to reverse may be to just read out the program memory and disassemble it.
For a serial protocol, it may be enough to just sniff the serial bus signals. That may not give the complete picture of the protocol, but is a good start. Done that a few times.
Cheers, heke
That definitely would help. It’s a socketed 32kx8 OTP M27C256B EPROM. Haven’t seen one of those in years - looks like I’ll need a reader and a decent disassembler. 
