C8051F50X_11 Datasheet, PDF (96/313 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family

C8051F50x/F51x
11.4. Serial Number Special Function Registers (SFRs)
The C8051F50x/F51x devices include four SFRs, SN0 through SN3, that are pre-programmed during pro-
duction with a unique, 32-bit serial number. The serial number provides a unique identification number for
each device and can be read from the application firmware. If the serial number is not used in the applica-
tion, these four registers can be used as general purpose SFRs.
SFR Definition 11.7. SNn: Serial Number n
Bit
7
6
5
4
3
2
1
0
Name
SERNUMn[7:0]
Type
R/W
Reset
Varies—Unique 32-bit value
SFR Addresses: SN0 = 0xF9; SN1 = 0xFA; SN2 = 0xFB; SN3 = 0xFC; SFR Page = 0x0F;
Bit
Name
Function
7:0 SERNUMn[7:0] Serial Number Bits.
The four serial number registers form a 32-bit serial number, with SN3 as the
most significant byte and SN0 as the least significant byte.
96
Rev. 1.2