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ROM
7.5
7.5.1
ROM Command Interpreter
Callable utilities
Functions available via the ROM Command Interpreter are summarized in Table 7-3 . For a general
overview of the user model associated with these functions , see “Packet transfers and commands
Even on secured devices, it is possible to return the device ID and revision numbers and to change the
flash-protection status. The latter does not waive security at all. Before attempting to mass-erase a secured
device via the ROM command interpreter, however, you must unprotect flash memory.
Table 7-3. Functions callable via ROM Interpreter 1
Command
CI_DEV_INFO
Description
Return device information
Five-bit
command
code
0x00
Secure mode
operation
Allowed
Details
Operation not
CI_READ_WRITE
Read/write memory (including flash
programming)
0x01
performed.
Security violation
returned.
CI_ERASE
Erase flash memory (page and
mass-erase)
0x02
Mass-erase only
Operation not
CI_CRC
Calculate CRC over memory range
0x04
performed.
Security violation
returned.
CI_RESET
CI_PROTECT
CI_UNPROTECT
RESET
Protect flash memory
Unprotect flash memory
0x05
0x07
0x08
Allowed
Allowed
Allowed
All other command codes return the RMF_ERROR_COMMAND code (bad command).
1
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
80
Freescale Semiconductor, Inc.
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