We are making a production product using the MSP430G2231 and want to keep the code a secret.
I have searched online and found out that blowing the security fuse disables access to the MCU.
Could somebody please clarify that by giving 6 and 7 V (100mA) for at least 1ms to the TEST pin we can blow the JTAG security fuse? Is this the right way to do it?
Best Answer
According to TI appnote SLAU320 the fuse is blown by applying Vpp to TEST pin:
But later down in the document it also says this in a subsection of the reference 1.4.1:
Which indicates that you apply the Vpp voltage, then setup the fuse blowing by writing on the JTAG interface. The IR_PREPARE_BLOW and IR_EX_BLOW are described in the document.