S9S12GN16F0CFT Freescale Semiconductor, S9S12GN16F0CFT Datasheet - Page 992
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S9S12GN16F0CFT
Manufacturer Part Number
S9S12GN16F0CFT
Description
16-bit Microcontrollers - MCU 16-bit16k Flash 2k RAM
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S12GN16F0CFT.pdf
(1292 pages)
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
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96 KByte Flash Module (S12FTMRG96K1V1)
28.3.2.2
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.
994
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 28-6. Flash Security Register (FSEC)
00
01
10
11
Figure
MC9S12G Family Reference Manual,
Table
Table 28-9. FSEC Field Descriptions
Table 28-10. Flash KEYEN States
F
5
1
28-10.
28-6. 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
Rev.1.23
F
2
1
Freescale Semiconductor
F
Table
1
1
Table
SEC[1:0]
28-4) as
28-11. If the
F
0
1
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