MM912H634CV1AE Freescale Semiconductor, MM912H634CV1AE Datasheet - Page 300

• Manufacturer Part Number: MM912H634CV1AE
• Description: 64KS12 LIN2xLS/HS Isense
• Manufacturer: Freescale Semiconductor
• Series: -r

Specifications of MM912H634CV1AE

• Applications: Automotive
• Core Processor: HCS12
• Program Memory Type: FLASH (64 kB)
• Controller Series: HCS12
• Ram Size: 6K x 8
• Interface: LIN
• Number Of I /o: -
• Voltage - Supply: 5.5 V ~ 27 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP Exposed Pad
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.40.3.2.2
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 0x3_FF0F located in P-Flash memory (see
a double bit fault is detected while reading the P-Flash 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]
Reset
RNV[5:2}
SEC[1:0]
W
R
Field
7–6
5–2
1–0
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
unsecured using backdoor key access, the SEC bits are forced to 10.
Note:
205.
206.
7
F
Flash Security Register (FSEC)
BUSCLK Frequency (MHz)
MIN
KEYEN[1:0]
10.6
12.6
13.6
14.6
15.6
11.6
1.0
1.6
2.6
3.6
4.6
5.6
6.6
7.6
8.6
9.6
BUSCLK is Greater Than this value.
BUSCLK is Less Than or Equal to this value.
(205)
Table
F
6
413.
= Unimplemented or Reserved
Table 410. FDIV values for various BUSCLK Frequencies
MAX
10.6
11.6
12.6
13.6
14.6
15.6
16.6
1.6
2.6
3.6
4.6
5.6
6.6
7.6
8.6
9.6
(206)
Table 411. Flash Security Register (FSEC)
Table 412. FSEC Field Descriptions
MM912_634 Advance Information, Rev. 4.0
F
5
FDIV[5:0]
0x0A
0x0B
0x0C
0x0D
0x0E
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0F
4
F
RNV[5:2]
Description
Table
BUSCLK Frequency (MHz)
MIN
16.6
17.6
18.6
19.6
20.6
21.6
22.6
23.6
24.6
25.6
26.6
27.6
28.6
29.6
30.6
31.6
(205)
404) as indicated by reset condition F in
3
F
MAX
18.6
27.6
28.6
31.6
17.6
19.6
20.6
21.6
22.6
23.6
24.6
25.6
26.6
29.6
30.6
32.6
(206)
2
F
Table
FDIV[5:0]
0x1C
0x1D
0x1A
0x1B
0x1E
0x1F
414. If the Flash module is
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
F
1
SEC[1:0]
Figure
0
F
411. If
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