16.7.1 Fuse Bit Mapping

One 32-bit word is reserved for boot configuration.

512 fuse bits are available for customer needs.

Writing a ‘1’ to SFR_SECURE.FUSE disables access to the Secure Fuse Controller (SFC).

To avoid any malfunctioning, the user must not write the “DO NOT USE (DNU)” fuse bits in the Boot Configuration area.

Table 16-9. Customer Fuse Matrix
SFC_DR Bits Use
16 [543:512] JTAG_DIS[543] SEC_DEBUG_DIS[542] Boot Configuration bits[541:512](1)
15 [511:480] USER_DATA[511:0]
14 [479:448]
13 [447:416]
12 [415:384]
11 [383:352]
10 [351:320]
9 [319:288]
8 [287:256]
7 [255:224]
6 [223:192]
5 [191:160]
4 [159:128]
3 [127:96]
2 [95:64]
1 [63:32]
0 [31:0]
Note: See section Boot Configuration Word for details on the contents of these bits.
Table 16-10. Special Function Bits
JTAG Disable (Fuse bit 543) Secure Debug Disable (Fuse bit 542) Description
0 0 Full JTAG debug allowed in Secure and Normal modes
0 1 JTAG debug allowed in Normal mode only (not in Secure mode)
1 X JTAG debug disabled