S9S12GN16F0CFT Freescale Semiconductor, S9S12GN16F0CFT Datasheet - Page 889

• Manufacturer Part Number: S9S12GN16F0CFT
• Description: 16-bit Microcontrollers - MCU 16-bit16k Flash 2k RAM
• Manufacturer: Freescale Semiconductor

Specifications of S9S12GN16F0CFT

• Rohs: yes
• Core: S12
• Processor Series: MC9S12G
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 16 KB
• Data Ram Size: 1024 B
• On-chip Adc: Yes
• Operating Supply Voltage: 3.13 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: TSSOP-20
• Mounting Style: SMD/SMT

26.3.2.2
The FSEC register holds all bits associated with the security of the MCU and Flash module.
1
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.
Freescale Semiconductor
KEYEN[1:0]
Loaded from IFR Flash configuration field, during reset sequence.
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.
Flash Security Register (FSEC)
F
7
1
KEYEN[1:0]
F
= Unimplemented or Reserved
6
1
1
Preferred KEYEN state to disable backdoor key access.
KEYEN[1:0]
Figure 26-6. Flash Security Register (FSEC)
MC9S12G Family Reference Manual, Rev.1.23
00
01
10
11
Figure
Table
Table 26-9. FSEC Field Descriptions
Table 26-10. Flash KEYEN States
F
5
1
26-10.
26-6. If a double bit fault is detected while reading the P-Flash
Status of Backdoor Key Access
F
4
1
RNV[5:2]
Description
DISABLED
DISABLED
DISABLED
ENABLED
F
3
1
1
48 KByte Flash Module (S12FTMRG48K1V1)
F
2
1
F
Table
1
1
Table
SEC[1:0]
26-4) as
26-11. If the
F
0
1
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