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CC1310: cc1310 32bit unique number

Part Number: CC1310

Hi, for  SW random generator initialization we need the unique 32 bit value for seed.

I found some registers in the Factory Configuration (FCFG) registers group (The FCFG are programmed by the TI production test for each device).

MAC_15_4_0 Register/MAC_15_4_1 Register is fine, but we need 32 bit value.

2 registers FLASH_NUMBER Register (Offset = 164h) & FLASH_COORDINATE Register (Offset = 16Ch looks unique but only taken together.

Q: what is the right choice for 32 bit register?