mc9s08lc60 Freescale Semiconductor, Inc, mc9s08lc60 Datasheet - Page 57
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mc9s08lc60
Manufacturer Part Number
mc9s08lc60
Description
Hcs08 Microcontrollers 8-bit Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S08LC60.pdf
(360 pages)
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4.6.2
During reset, the contents of the nonvolatile location NVOPT are copied from FLASH into FOPT. Bits 5
through 2 are not used and always read 0. This register may be read at any time, but writes have no meaning
or effect. To change the value in this register, erase and reprogram the NVOPT location in FLASH memory
as usual and then issue a new MCU reset.
Freescale Semiconductor
SEC0[1:0]
FNORED
200 kHz
150 kHz
20 MHz
10 MHz
Reset
KEYEN
8 MHz
4 MHz
2 MHz
1 MHz
Field
f
Bus
1:0
7
6
W
R
KEYEN
FLASH Options Register (FOPT and NVOPT)
Backdoor Key Mechanism Enable — When this bit is 0, the backdoor key mechanism cannot be used to
disengage security. The backdoor key mechanism is accessible only from user (secured) firmware. BDM
commands cannot be used to write key comparison values that would unlock the backdoor key. For more detailed
information about the backdoor key mechanism, refer to
0 No backdoor key access allowed.
1 If user firmware writes an 8-byte value that matches the nonvolatile backdoor key (NVBACKKEY through
Flash No Redirect (Vector Redirection Disable) — When this bit is 1, then vector redirection is disabled.
0 Vector redirection enabled.
1 Vector redirection disabled.
Security State Code — This 2-bit field determines the security state of the MCU as shown in
the MCU is secure, the contents of RAM and FLASH memory cannot be accessed by instructions from any
unsecured source including the background debug interface. For more detailed information about security, refer
to
7
Section 4.5,
NVBACKKEY+7, in that order), security is temporarily disengaged until the next MCU reset.
(Binary)
PRDIV8
= Unimplemented or Reserved
1
0
0
0
0
0
0
0
FNORED
“Security.”
6
MC9S08LC60 Series Data Sheet: Technical Data, Rev. 4
This register is loaded from nonvolatile location NVOPT during reset.
Figure 4-6. FLASH Options Register (FOPT)
Table 4-7. FLASH Clock Divider Settings
Table 4-8. FOPT Field Descriptions
0
5
DIV5:DIV0
(Decimal)
12
49
39
19
9
4
0
0
0
4
Description
Section 4.5,
192.3 kHz
0
3
200 kHz
200 kHz
200 kHz
200 kHz
200 kHz
200 kHz
150 kHz
f
FCLK
“Security.”
0
2
Program/Erase Timing Pulse
(5 μs Min, 6.7 μs Max)
SEC01
1
5.2 μs
6.7 μs
5 μs
5 μs
5 μs
5 μs
5 μs
5 μs
Table
Chapter 4 Memory
4-9. When
SEC00
0
57
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