mc9s12q128 Freescale Semiconductor, Inc, mc9s12q128 Datasheet - Page 538
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mc9s12q128
Manufacturer Part Number
mc9s12q128
Description
Hcs12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12Q128.pdf
(644 pages)
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Chapter 19 96 Kbyte Flash Module (S12FTS96KV1)
The security function in the Flash module is described in
19.3.2.3
This register is reserved for factory testing and is not accessible to the user.
All bits read 0 and are not writable.
538
Module Base + 0x0002
KEYEN[1:0]
SEC[1:0]
NV[5:2]
Reset
Field
7–6
5–2
1–0
W
R
Backdoor Key Security Enable Bits — The KEYEN[1:0] bits define the enabling of the backdoor key access
to the Flash module as shown in
Nonvolatile Flag Bits — The NV[5:2] bits are available to the user as nonvolatile flags.
Flash Security Bits — The SEC[1:0] bits define the security state of the MCU as shown in
Flash module is unsecured using backdoor key access, the SEC[1:0] bits are forced to 1:0.
RESERVED1
0
0
7
= Unimplemented or Reserved
0
0
6
1. Preferred KEYEN state to disable Backdoor Key Access.
1. Preferred SEC state to set MCU to secured state.
KEYEN[1:0]
SEC[1:0]
01
01
00
10
11
00
10
11
Table 19-4. FSEC Field Descriptions
(1)
(1)
Table 19-6. Flash Security States
Table 19-5. Flash KEYEN States
0
0
5
Table
Figure 19-6. RESERVED1
19-5.
Status of Backdoor Key Access
MC9S12Q128
Rev 1.09
0
0
4
Status of Security
Description
Unsecured
Secured
Secured
Secured
DISABLED
DISABLED
DISABLED
ENABLED
Section 19.4.3, “Flash Module
0
0
3
0
0
2
Freescale Semiconductor
0
0
1
Table
Security”.
19-6. If the
0
0
0
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