S912XET512J3VALR Freescale Semiconductor, S912XET512J3VALR Datasheet - Page 1029
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S912XET512J3VALR
Manufacturer Part Number
S912XET512J3VALR
Description
16-bit Microcontrollers - MCU 16 BIT,512K FLASH
Manufacturer
Freescale Semiconductor
Datasheet
1.S912XEG128J2MAL.pdf
(1324 pages)
Specifications of S912XET512J3VALR
Rohs
yes
Core
HCS12X
Processor Series
MC9S12XE
Data Bus Width
16 bit
Maximum Clock Frequency
50 MHz
Program Memory Size
512 KB
Data Ram Size
32 KB
On-chip Adc
Yes
Operating Supply Voltage
3.13 V to 5.5 V
Operating Temperature Range
- 40 C to + 105 C
Package / Case
LQFP-112
Mounting Style
SMD/SMT
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
S912XET512J3VALR
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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27.3.2.2
The FSEC register holds all bits associated with the security of the MCU and Flash module.
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 0x7F_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]
RNV[5:2}
SEC[1:0]
Offset Module Base + 0x0001
Reset
2. FDIV shown generates an FCLK frequency of 1.05 MHz
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
KEYEN[1:0]
= Unimplemented or Reserved
F
6
1. Preferred KEYEN state to disable backdoor key access.
KEYEN[1:0]
Figure 27-6. Flash Security Register (FSEC)
MC9S12XE-Family Reference Manual Rev. 1.25
00
01
10
11
Figure
Table 27-10. FSEC Field Descriptions
Table
Table 27-11. Flash KEYEN States
F
5
27-11.
27-6. If a double bit fault is detected while reading the P-Flash
Status of Backdoor Key Access
F
4
RNV[5:2]
Description
DISABLED
DISABLED
DISABLED
ENABLED
Chapter 27 512 KByte Flash Module (S12XFTM512K3V1)
F
3
(1)
F
2
F
1
Table
Table
SEC[1:0]
27-12. If the
27-3) as
F
0
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