MMC2107 - Freescale Semiconductor

Non-Volatile Memory FLASH (CMFR)
Freescale Semiconductor, Inc.
1.
OVERRIDE FIRMWARE AMPLITUDE MODULATION
PAWS[2:0] = 111 IN CMFRMTR
2.
DISABLE PROTECTION OF THE BLOCKS TO BE ERASED
PROTECT[7:0] IN CMFRMCR
3.1.
WRITE THE PULSE WIDTH TIMING CONTROL
FIELDS FOR A ERASE PULSE (SEE TABLE 9-8)
SCLKR[2:0], CLKPE[1:0], CLKPM[6:0] IN CMFRCTL
nc...
Freescale Semiconductor, I
UPDATE PAWS
AND NVR,
IF REQUIRED
FAILED
3.2.
3.3.
4.
5.
7.
8.
9.
EXECUTE AN ERASE INTERLOCK WRITE TO ANY
ARRAY LOCATION TO BE ERASED
NO
SELECT ERASE OPERATION AND SELECT
THE ARRAY BLOCK TO BE ERASED
ERASE = 1, BLOCK[7:0] IN CMFRCTL
CONFIGURE CMFR FOR PROGRAM OPERATION
SES = 1 IN CMFRCTL
ENABLE HIGH-VOLTAGE PULSE FOR ERASING
EHV = 1 IN CMFRCTL
6.
PULSE APPLIED TO THE
CMFR ARRAY BLOCK?
HVS = 0 IN CMFRCTL
YES
DISABLE HIGH-VOLTAGE PULSE
EHV = 0 IN CMFRCTL
VERIFICATION PROCESS
OK
END OF THE ERASING SEQUENCE
SES = 0 IN CMFRCTL
Note: Make sure that CMFRMTR is i its reset state at the beginning of the erasing
process and afterwards.
Figure 9-9. FLASH Erasing Flowchart
Technical Data MMC2107 – Rev. 2.0
216 Non-Volatile Memory FLASH (CMFR) MOTOROLA
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