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CHAPTER 28 3M-BIT FLASH MEMORY
28.6.4
Sector Erase Timer Flag (DQ3)
The sector erase timer flag (DQ3) is used to post whether the automatic algorithm is
being executed during the sector erase wait period after the Sector Erase command has
been started.
■
Sector Erase Timer Flag (DQ3)
Table 28.6-9 lists the sector erase timer flag state transitions (state change for normal operation) and Table
28.6-10 lists the sector erase timer flag state transitions (state change for abnormal operation).
●
Sector erase
Read-access after the Sector Erase command has been started causes the flash memory to output "0" if the
automatic algorithm is being executed during the sector erase wait period, regardless of the value at the
address specified by the address signal of the sector that issued the command. The flash memory outputs
"1" if the sector erase wait period has been exceeded.
If the data polling function or toggle bit function indicates that the erase algorithm is being executed,
internally controlled erase has already started if this flag is "1". Continuous write of the sector erase codes
or commands other than the Sector Erase Suspend command will be ignored until erase is terminated.
If this flag is "0", the flash memory will accept write of additional sector erase codes. To confirm this, it is
recommended that the state of this flag be checked before continuing to write sector erase codes. If this flag
is "1" after the second state check, it is possible that additional sector erase codes may not be accepted.
Table 28.6-9 Sector Erase Timer Flag State Transitions (State Change for Normal Operation)
Operating
state
Write
→
Completed
Chip/sector
erase
→
Completed
Sector
erase wait
→
Started
Sector erase
→
Erase
suspend
(sector being
erased)
Sector erase
suspend
→
Restarted
(sector being
erased)
Sector erase
suspended
(sector not
being erased)
DQ3
0
→
DATA:3
1
0
→
1
1
→
0
0
→
1
DATA:3
Table 28.6-10 Sector Erase Timer Flag State Transitions (State Change for Abnormal
Operation)
Operating state
Write
Chip/sector erase
DQ3
0
1
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
Страница 18: ...xiv ...
Страница 132: ...104 CHAPTER 5 CLOCKS ...
Страница 152: ...124 CHAPTER 6 CLOCK MODULATOR ...
Страница 210: ...182 CHAPTER 11 TIME BASE TIMER ...
Страница 218: ...190 CHAPTER 12 WATCHDOG TIMER ...
Страница 264: ...236 CHAPTER 14 16 BIT RELOAD TIMER WITH EVENT COUNT FUNCTION ...
Страница 274: ...246 CHAPTER 15 WATCH TIMER ...
Страница 306: ...278 CHAPTER 17 DTP EXTERNAL INTERRUPTS ...
Страница 338: ...310 CHAPTER 18 8 10 BIT A D CONVERTER ...
Страница 364: ...336 CHAPTER 19 UART0 UART1 ...
Страница 398: ...370 CHAPTER 20 UART2 UART3 Figure 20 5 2 ORE Set Timing Receive data RDRF ORE ...
Страница 432: ...404 CHAPTER 20 UART2 UART3 ...
Страница 482: ...454 CHAPTER 22 SERIAL I O ...
Страница 560: ...532 CHAPTER 24 STEPPING MOTOR CONTROLLER ...
Страница 582: ...554 CHAPTER 27 ROM MIRRORING MODULE ...
Страница 632: ...604 CHAPTER 29 EXAMPLES OF SERIAL PROGRAMMING CONNECTION ...
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Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
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