Datasheet

147
32072H–AVR32–10/2012
AT32UC3A3
12.9 Fuses Settings
The flash block contains 32 general purpose fuses. These 32 fuses can be found in the Flash
General Purpose Fuse Register Low (FGPFRLO) of the Flash Controller (FLASHC).
Some of the FGPFRLO fuses have defined meanings outside the FLASHC and are described in
this section.
The general purpose fuses are set by a JTAG chip erase.
12.9.1 Flash General Purpose Fuse Register Low (FGPFRLO)
• BODEN: Brown Out Detector Enable
• BODHYST: Brown Out Detector Hystersis
0: The BOD hysteresis is disabled
1: The BOD hysteresis is enabled
• BODLEVEL: Brown Out Detector Trigger Level
This controls the voltage trigger level for the Brown out detector. For value description refer to Electrical Characteristics chapter.
If the BODLEVEL is set higher than VDDCORE and enabled by fuses, the part will be in constant reset. To recover from this
situation, apply an external voltage on VDDCORE that is higher than the BOD Trigger level and disable the BOD.
• LOCK, EPFL, BOOTPROT
These are Flash controller fuses and are described in the FLASHC chapter.
12.9.2 Default Fuse Value
The devices are shipped with the FGPFRLO register value: 0xFFF7FFFF:
• GPF31 reserved for future use
Table 12-8. FGPFRLO Register Description
31 30 29 28 27 26 25 24
GPF31 GPF30 GPF29 BODEN BODHYST BODLEVEL[5:4]
23 22 21 20 19 18 17 16
BODLEVEL[3:0] BOOTPROT EPFL
15 14 13 12 11 10 9 8
LOCK[15:8]
76543210
LOCK[7:0]
Table 12-9. BODEN Field Description
BODEN Description
0x0 Brown Out Detector (BOD) disabled
0x1 BOD enabled, BOD reset enabled
0x2 BOD enabled, BOD reset disabled
0x3 BOD disabled