For fun I have taken it upon myself to try to reverse engineer a consumer blood pressure device. The device uses a C8051F007 32 pin MCU. I am trying to figure out how I can eavesdrop on the communication between the MCU and the various sensors so I can obtain blood pressure readings. From the documents I have read the chip supports in system JTAG debugging. I don't know enough yet to utilize this knowledge.
What am I trying to do is identify the UART pins or any kind of serial communication pins. I have an oscilloscope and am hoping I will be able to identify some values in the communication.I need some tips on figuring out how to get data off this chip
Here is the pinout (notice no TX or RX)
Any information or tips will be welcomed.