DEMO9S08EL32 Freescale Semiconductor, DEMO9S08EL32 Datasheet - Page 57

• Manufacturer Part Number: DEMO9S08EL32
• Description: BOARD DEMO FOR 9S08 EL MCU
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S08EL32

• Contents: Evaluation Board
• Processor To Be Evaluated: MC9S08EL32
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 12 V
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08EL
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08EL32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.5.11.2
During reset, the contents of the nonvolatile location NVOPT are copied from FLASH into FOPT. 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
EPGMOD
FNORED
Reset
KEYEN
Field
SEC
1:0
7
6
5
W
R
KEYEN
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
Vector Redirection Disable — When this bit is 1, then vector redirection is disabled.
0 Vector redirection enabled.
1 Vector redirection disabled.
EEPROM Sector Mode — When this bit is 0, each sector is split into two pages (4-byte mode). When this bit is
1, each sector is in a single page (8-byte mode).
0 Half of each EEPROM sector is in Page 0 and the other half is in Page 1.
1 Each sector is in a single page.
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, EEPROM and FLASH memory cannot be accessed by instructions
from any unsecured source including the background debug interface. SEC changes to 1:0 after successful
backdoor key entry or a successful blank check of FLASH. For more detailed information about security, refer to
Section 4.5.9,
FLASH and EEPROM Options Register (FOPT and NVOPT)
F
7
NVBACKKEY+7 in that order), security is temporarily disengaged until the next MCU reset.
= Unimplemented or Reserved
FNORED
Figure 4-6. FLASH and EEPROM Options Register (FOPT)
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
“Security.”
F
6
1
SEC changes to 1:0 after successful backdoor key entry
or a successful blank check of FLASH.
Table 4-8. FOPT Register Field Descriptions
EPGMOD
SEC[1:0]
F
5
0:0
0:1
1:0
1:1
Table 4-9. Security States
0
0
4
Description
Section 4.5.9,
Description
unsecured
secure
secure
secure
3
0
0
1
“Security.”
0
0
2
F
1
Table
Chapter 4 Memory
SEC
4-9. When
F
0
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