C8051F91X-C8051F90X View Datasheet(PDF) - Silicon Laboratories
Part Name
Description
MFG CO.
C8051F91X-C8051F90X
Silicon Laboratories
C8051F91X-C8051F90X Datasheet PDF : 318 Pages
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C8051F91x-C8051F90x
Table 13.1. Flash Security Summary
Action
C2 Debug User Firmware executing from:
Interface
an unlocked page a locked page
Read, Write or Erase unlocked pages
(except page with Lock Byte)
Read, Write or Erase locked pages
(except page with Lock Byte)
Read or Write page containing Lock Byte
(if no pages are locked)
Read or Write page containing Lock Byte
(if any page is locked)
Read contents of Lock Byte
(if no pages are locked)
Read contents of Lock Byte
(if any page is locked)
Erase page containing Lock Byte
(if no pages are locked)
Erase page containing Lock Byte - Unlock all pages
(if any page is locked)
Lock additional pages
(change 1s to 0s in the Lock Byte)
Unlock individual pages
(change 0s to 1s in the Lock Byte)
Read, Write or Erase Reserved Area
Permitted Permitted
Not Permitted FEDR
Permitted Permitted
Not Permitted FEDR
Permitted Permitted
Not Permitted FEDR
Permitted FEDR
Only by C2DE FEDR
Not Permitted FEDR
Not Permitted FEDR
Not Permitted FEDR
Permitted
Permitted
Permitted
Permitted
Permitted
Permitted
FEDR
FEDR
FEDR
FEDR
FEDR
C2DE—C2 Device Erase (Erases all Flash pages including the page containing the Lock Byte)
FEDR—Not permitted; Causes Flash Error Device Reset (FERROR bit in RSTSRC is 1 after reset)
• All prohibited operations that are performed via the C2 interface are ignored (do not cause device
reset).
• Locking any Flash page also locks the page containing the Lock Byte.
• Once written to, the Lock Byte cannot be modified except by performing a C2 Device Erase.
• If user code writes to the Lock Byte, the Lock does not take effect until the next device reset.
• The scratchpad is locked when all other Flash pages are locked.
• The scratchpad is erased when a Flash Device Erase command is performed.
Rev. 1.0
135
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