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Flash Memory Controller
state, calls the appropriate ROM routine and then returns to User mode. For additional details, see
Any attempt to directly write any flash controller registers in normal mode of operation will result in
generation of an access-error exception.
6.3
Modes of operation
There are four user modes of operation for the flash controller: IDLE, READ, PROGRAM and ERASE.
PROGRAM and ERASE modes will only be reached while CPU is in Supervisor state.
6.3.1
Flash IDLE
Whenever the flash is not accessed by the CPU, including during WAIT and STOP modes, it will be in this
IDLE mode. The flash module will be in standby and consume minimal power.
6.3.2
Flash READ
The flash will be in READ mode when it is read by the CPU. However, when the flash is in either
PROGRAM or ERASE mode, the flash module cannot be read. Any attempt to read data from flash will
return undefined data.
6.3.3
Flash PROGRAM
In this mode, the flash array can be programmed 32 bits at a time. Individual data bits can be programmed
from 1 to 0, but not from 0 to 1.
6.3.4
Flash ERASE
Flash memory can be erased one page (512 bytes) at a time or the entire main array can be erased in one
mass-erase action.
The erase state of all data bits in the array is 1.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
63
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