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Figure 24.7-2 Example of the Flash Memory Chip Procedure
FMCS: WE (bit 5)
Flash programming enabled
Erase command sequence
(1) FFAAAA ← XXAA
(2) FF5554 ← XX55
(3) FFAAAA ← XX80
(4) FFAAAA ← XXAA
(5) FF5554 ← XX55
(6) FFAAAA ← XX10
0
NO
FMCS: WE (bit 5)
Erase error
Disable flash memory erase
Start writing
Read internal address 1
Read internal address 2
Toggle bit (DQ6)
data1(DQ6)=data2(DQ6)
NO
Timing limit (DQ5)
1
Read internal address 1
Read internal address 2
Toggle bit (DQ6)
data1(DQ6)=data2(DQ6)
YES
Completed
CHAPTER 24 512K-BIT FLASH MEMORY
YES
: Check by hardware
sequence flag
549
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