Inquiry Kinetis manual

[lim]

Hi NXP

I found a Flash Security (FSEC)  register difference on manual

AN4507 - Kinetis manual

7      6            5      4           3         2          1    0 

KEYEN         MEEN           FSLACC          SEC

KEA64RM - KEA64RM manual

7         6            5     4       3    2                 1     0

KEYEN                 Reserved                       SEC

Can't we use a MEEN register on a KEA64RM ?

can i know which register is correct?

[nxf56274 · Accepted solution]

Hi,

The mcu RM is more accurate than the application note. So if the kea64 RM doesn't describe the bit, we shouldn't use it.

Have a great day,

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[lim]

I have an additional question.

AN4507 - Kinetis manual

Mass erase is disabled (MEEN 10)

I want use a mass erase disabled function on KEA64

but on KEA64RM MEEN is reserved , so we can't use that function on KEA64?

[nxf56274]

Hi,

Yeah, you are right

[lim]

Hi

Mass erase is disabled (MEEN 10)

Is there any other way to disable that function?

Thank you

[nxf56274]

Hi,

May be you can refer the FPROT. It can protect the flash from programming and erasing.

BR,

Da

[lim]

Thank you 

if we enable the FPROT , mass erase is still working right? (JTAG)

[nxf56274]

Hi,

Yes. You can also try to use the backdoor key to set the flash as security to avoid being erased.

[lim]

Thank you very mcuh.!