mc9s12c32mpb16 Freescale Semiconductor, Inc, mc9s12c32mpb16 Datasheet - Page 475

• Manufacturer Part Number: mc9s12c32mpb16
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

The security function in the Flash module is described in
17.3.2.3
This register is reserved for factory testing and is not accessible to the user.
All bits read 0 and are not writable.
Freescale Semiconductor
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 17-4. FSEC Field Descriptions
(1)
(1)
Table 17-6. Flash Security States
MC9S12C-Family / MC9S12GC-Family
Table 17-5. Flash KEYEN States
0
0
5
Table
Figure 17-6. RESERVED1
17-5.
Status of Backdoor Key Access
Rev 01.23
0
0
4
Status of Security
Description
Unsecured
Secured
Secured
Secured
DISABLED
DISABLED
DISABLED
ENABLED
Section 17.4.3, “Flash Module
0
0
3
Chapter 17 16 Kbyte Flash Module (S12FTS16KV1)
0
0
2
0
0
1
Table
Security”.
17-6. If the
0
0
0
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