MC9S12G FREESCALE [Freescale Semiconductor, Inc], MC9S12G Datasheet - Page 1031

• Manufacturer Part Number: MC9S12G
• Description: Ignores external trigger. Performs one conversion sequence and stops.
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

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
28.3.2.3
The FCCOBIX register is used to index the FCCOB register for Flash memory operations.
Freescale Semiconductor
KEYEN[1:0]
RNV[5:2]
SEC[1:0]
Offset Module Base + 0x0002
Reset
Field
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.
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.
Flash CCOB Index Register (FCCOBIX)
0
0
7
= Unimplemented or Reserved
0
0
6
1
1
Preferred KEYEN state to disable backdoor key access.
Preferred SEC state to set MCU to secured state.
KEYEN[1:0]
Figure 28-7. FCCOB Index Register (FCCOBIX)
SEC[1:0]
MC9S12G Family Reference Manual, Rev.1.01
00
01
10
11
00
01
10
11
Figure
Table
Table 28-9. FSEC Field Descriptions
Table 28-11. Flash Security States
Table 28-10. Flash KEYEN States
5
0
0
28-10.
28-6. If a double bit fault is detected while reading the P-Flash
Status of Backdoor Key Access
0
0
4
Status of Security
Description
UNSECURED
DISABLED
SECURED
DISABLED
DISABLED
SECURED
SECURED
ENABLED
Section
0
0
3
1
1
28.5.
240 KByte Flash Module (S12FTMRG240K2V1)
2
0
CCOBIX[2:0]
0
1
Table
28-11. If the
0
0
1031