mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 495

• Manufacturer Part Number: mcf51jf128
• Description: Mcf51jf128 Reference Manual
• Manufacturer: Freescale Semiconductor, Inc

During the reset sequence, the register is loaded with the contents of the flash security
byte in the Flash Configuration Field located in program flash memory. The Flash basis
for the values is signified by X in the reset value.
Address: FTFL_FSEC is FFFF_84E0h base + 1h offset = FFFF_84E1h
* Notes:
•
Freescale Semiconductor, Inc.
x = Undefined at reset.
FSLACC
KEYEN
MEEN
Reset
Field
SEC
Read
7–6
5–4
3–2
1–0
Write
Bit
Backdoor Key Security Enable
These bits enable and disable backdoor key access to the FTFL module.
00
01
10
11
Mass Erase Enable Bits
Enables and disables mass erase capability of the FTFL module. The state of the MEEN bits is only
relevant when the SEC bits are set to secure outside of NVM Normal Mode. When the SEC field is set to
unsecure, the MEEN setting does not matter.
00
01
10
11
Freescale Failure Analysis Access Code
These bits enable or disable access to the flash memory contents during returned part failure analysis at
Freescale. When SEC is secure and FSLACC is denied, access to the program flash contents is denied
and any failure analysis performed by Freescale factory test must begin with a full erase to unsecure the
part.
When access is granted (SEC is unsecure, or SEC is secure and FSLACC is granted), Freescale factory
testing has visibility of the current flash contents. The state of the FSLACC bits is only relevant when the
SEC bits are set to secure. When the SEC field is set to unsecure, the FSLACC setting does not matter.
00
01
10
11
Flash Security
x*
7
KEYEN
Backdoor key access disabled
Backdoor key access disabled (preferred KEYEN state to disable backdoor key access)
Backdoor key access enabled
Backdoor key access disabled
Mass erase is enabled
Mass erase is enabled
Mass erase is disabled
Mass erase is enabled
Freescale factory access granted
Freescale factory access denied
Freescale factory access denied
Freescale factory access granted
x*
6
MCF51JF128 Reference Manual, Rev. 2, 03/2011
FTFL_FSEC field descriptions
Table continues on the next page...
x*
5
MEEN
Preliminary
x*
4
Description
x*
3
FSLACC
Chapter 23 Flash Memory Module (FTFL)
x*
2
x*
1
SEC
x*
0
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