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7.6.4
7.6.4.1
RMF_FLASH_PROTECT and RMF_FLASH_UNPROTECT
Description
These complementary functions allow temporary (until the next reset sequence) changes in the protection
status of flash memory. Their sole function is to manipulate the protection functions in the flash options
register (FOPT[PW, PROTB]) to their proper states.
Separating changes in protection from programming/erase operations improves the odds against accidental
programming/erasure of flash.
The NVOPT byte in the main flash array must be reprogrammed to effect any permanent change in the
protection state of the part. “Flash Options register” on page 66 for additional details.
7.6.4.2
RMF_FLASH_PROTECT and RMF_FLASH_UNPROTECT input structure
No parameters are necessary for either function. Supply a NULL structure pointer to the call_trap()
function when invoking these functions.
7.6.4.3
RMF_FLASH_PROTECT and RMF_FLASH_UNPROTECT output
structure
These functions always succeed. They return a NULL pointer.
7.6.4.4
RMF_FLASH_PROTECT/UNPROTECT access/security policies
These functions may be called at any time.
Example 7-11. Function access/security
call_trap(RMF_FLASH_UNPROTECT, NULL);// unprotect flash
call_trap(RMF_FLASH_PROTECT, NULL); // protect flash
7.6.5
7.6.5.1
RMF_FLASH_UNSECURE
Description
This function allows temporary (until the next reset sequence) changes in the security status of the device.
Its sole function is to manipulate the security functions in the flash options register (FOPT[SSW, SSC]) to
their proper states.
The NVOPT byte in the main flash array must be reprogrammed to effect any permanent change in the
security state of the part. “Security” on page 69 for additional details.
7.6.5.2
RMF_FLASH_UNSECURE input structure
No parameters are necessary. Supply a NULL structure pointer to the call_trap() function when invoking
this function.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
111
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