sc9s12hy64j0vllr Freescale Semiconductor, Inc, sc9s12hy64j0vllr Datasheet - Page 524

• Manufacturer Part Number: sc9s12hy64j0vllr
• Description: S12 Microcontrollers Mcu 16-bit Hcs12 Cisc 32kb Flash 5v Tray
• Manufacturer: Freescale Semiconductor, Inc

32 KByte Flash Module (S12FTMRC32K1V1)
All bits in the FSEC register are readable but not writable.
During the reset sequence, the FSEC register is loaded with the contents of the Flash security byte in the
Flash configuration field at global address 0x3_FF0F located in P-Flash memory (see
indicated by reset condition F in
phrase containing the Flash security byte during the reset sequence, all bits in the FSEC register will be
set to leave the Flash module in a secured state with backdoor key access disabled.
The security function in the Flash module is described in
524
KEYEN[1:0]
RNV[5:2}
SEC[1:0]
Offset Module Base + 0x0001
Reset
Field
7–6
5–2
1–0
W
R
Backdoor Key Security Enable Bits — The KEYEN[1:0] bits define the enabling of backdoor key access to the
Flash module as shown in
Reserved Nonvolatile Bits — The RNV bits should remain in the erased state for future enhancements.
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 bits are forced to 10.
F
7
KEYEN[1:0]
= Unimplemented or Reserved
F
6
1
1
Preferred KEYEN state to disable backdoor key access.
Preferred SEC state to set MCU to secured state.
KEYEN[1:0]
SEC[1:0]
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
Figure 15-6. Flash Security Register (FSEC)
00
01
10
11
00
01
10
11
Figure
Table
Table 15-8. FSEC Field Descriptions
Table 15-10. Flash Security States
Table 15-9. Flash KEYEN States
F
5
15-9.
15-6. If a double bit fault is detected while reading the P-Flash
Status of Backdoor Key Access
F
4
Status of Security
RNV[5:2]
Description
UNSECURED
DISABLED
SECURED
DISABLED
DISABLED
SECURED
SECURED
ENABLED
Section
F
3
1
1
15.5.
F
2
Freescale Semiconductor
Table
F
1
Table
SEC[1:0]
15-3) as
15-10. If the
F
0