mm912f634 Freescale Semiconductor, Inc, mm912f634 Datasheet - Page 288

• Manufacturer Part Number: mm912f634
• Description: Mm912f634 - Integrated S12 Based Relay Driver With Lin
• Manufacturer: Freescale Semiconductor, Inc

Functional Description and Application Information
4.36.4.2.4
The sector erase operation will erase all addresses in a 512 byte sector of Flash memory using an embedded algorithm. The
overall erase time has been divided into 16 erase pulses to allow faster system response. The customer application has to
guarantee all 16 pulses are performed before writing into the Flash sector being erased. There is no requirement to have those
pulses as consecutive operations.
An example flow to execute the sector erase operation is shown in
follows:
If a Flash sector to be erased is in a protected area of the Flash block, the PVIOL flag in the FSTAT register will set and the sector
erase command will not launch. Once the sector erase command has successfully launched, the CCIF flag in the FSTAT register
will set after the sector erase operation has completed.
Freescale Semiconductor
1.
2.
3.
4.
5.
Write to an aligned Flash block address to start the command write sequence for the sector erase command. The Flash
address written determines the sector to be erased while the data written is ignored.
Write the sector erase command, 0x40, to the FCMD register.
Clear the CBEIF flag in the FSTAT register by writing a 1 to CBEIF to launch the sector erase command.
Wait for the CCIF flag in the FSTAT register to set signifying completion of the sector erase operation.
Repeat steps 1 through 4 until all 16 sector erase pulses have been executed. Address must be in the same Flash
sector.
Sector Erase Command
In case the PVIOL or ACCERR flags are asserted by some event occurring in between the
erase pulses, the customer application must clear the flags in FSTAT register before
resuming the sequence of 16 pulses.
NOTE
Figure
89. The sector erase command write sequence is as
32 kbyte Flash Module (S12SFTSR32KV1)
MM912F634
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