Fig. 25.4 Example Of Sector Erasing Procedure - Fujitsu MB90420/5 (A) Series Hardware Manual

MB90420/5 (A) SERIES F
1
Sector erase timer (DQ3)
Internal address read
Erasing error

Fig. 25.4 Example of Sector Erasing Procedure

2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
Start
FMCS: WE (bit 5)
Erasing enabled
Erase command sequence
1. FxAAAA ← XXAA
2. Fx5554 ← XX55
3. FxAAAA ← XX80
4. FxAAAA ← XXAA
5. Fx5554 ← XX55
0
Code input to sector to be
erased (30H)
Y
Is any sector to be
erased?
Internal address read 1
Internal address read 2
Toggle bit (DQ6)
Data 1 (DQ6) = Data 2 (DQ6)
0
Timing limit (DQ5)
Internal address read1
Internal address read2
Toggle bit (DQ6)
N
Data 1 (DQ6) = Data 2 (DQ6)
Y
Last sector
Y
FMCS: WE (bit 5)
Erasing disabled
Erasing
completed
25-20
N
Y
N
1
N
Check by hardware
sequence flag
Next address