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ROM
7.6.3
7.6.3.1
RMF_FLASH_ERASE
Description
All user access to the flash-controller erase functions (both page-erase and mass-erase) is via this function.
Interrupts are disabled when this function executes and STOP-mode operation is temporarily disabled.
System clocks will remain in their high speed states (8 MHz) during erase operations.
Because flash operations interfere with STOP-mode operation, their use is not consistent with normal
sensor operation as described in Chapter 4, “Operational Phases and Modes of Operation” . Frame
operation will need to be suspended during use of this function.
NOTE
The flash-controller hardware is not accessible outside of Supervisor mode.
Accessing flash-controller hardware by a Supervisor-mode method other
than this function (and companion functions, listed herein) is strongly
discouraged.
This main flash array is composed of 32 pages of 512 bytes each. One page is the minimum amount of
flash that can be erased. The primary input attribute to this function is a 32-bit, unsigned long used to
identify pages to be erased or not. Bit 0 corresponds to the page beginning at address 0x(00)00_0000. Bit
31 corresponds to the page beginning at 0x(00)00_3E00. Set each bit to “1” to protect it from erase or to
“0” to erase.
Flash protection must be disabled prior to calling RMF_FLASH_ERASE. This is done by calling
RMF_UNPROTECT. Once the erase operation is done, re-assert flash protection by calling
RMF_PROTECT.
7.6.3.2
RMF_FLASH_ERASE input structure
Example 7-8. Input structure syntax
typedef struct {
unsigned long pw;
unsigned long mask;
unsigned short verify;
unsigned short reserved; // write as 0
unsigned short reserved2; // write as 0
} rmf_flash_erase_params_t;
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
108
Freescale Semiconductor, Inc.
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