DEMO9S08EL32 Freescale Semiconductor, DEMO9S08EL32 Datasheet - Page 45

• 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

0xFFAE
0xFFAF
0xFFB0 –
0xFFB7
0xFFB8 –
0xFFBC
0xFFBD
0xFFBE
0xFFBF
Nonvolatile FLASH registers, shown in
include an 8-byte backdoor key, NVBACKKEY, which can be used to gain access to secure memory
resources. During reset events, the contents of NVPROT and NVOPT in the nonvolatile register area of
the FLASH memory are transferred into corresponding FPROT and FOPT working registers in the
high-page registers to control security and block protection options.
Provided the key enable (KEYEN) bit is 1, the 8-byte comparison key can be used to temporarily
disengage memory security. This key mechanism can be accessed only through user code running in secure
memory. (A security key cannot be entered directly through background debug commands.) This security
key can be disabled completely by programming the KEYEN bit to 0. If the security key is disabled, the
only way to disengage security is by mass erasing the FLASH if needed (normally through the background
debug interface) and verifying that FLASH is blank. To avoid returning to secure mode after the next reset,
program the security bits (SEC) to the unsecured state (1:0).
Freescale Semiconductor
Address
Reserved for
FTRIM storage
Reserved for
ICSTRM storage
NVBACKKEY
Reserved
NVPROT
Reserved
NVOPT
Register Name
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
KEYEN
Bit 7
—
—
—
—
Table 4-4. Nonvolatile Register Summary
EPS
FNORED EPGMOD
—
—
—
—
6
Table
4-4, are located in the FLASH memory. These registers
—
—
—
—
5
8-Byte Comparison Key
—
—
—
—
—
4
TRIM
FPS
—
—
—
—
—
3
—
—
—
—
—
2
—
—
—
—
1
Chapter 4 Memory
SEC
FTRIM
FPOP
Bit 0
—
—
—
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