573
CHAPTER 28 3M-BIT FLASH MEMORY
28.6.5
Toggle Bit-2 Flag (DQ2)
The toggle bit-2 flag (DQ2) is a flag that uses the toggle bit function to indicate that the
sector is in the erase-suspended state.
■
Toggle Bit-2 Flag (DQ2)
Table 28.6-11 lists the toggle bit-2 flag state transitions (state change for normal operation) and Table 28.6-
12 lists the toggle bit-2 flag state transitions (state change for abnormal operation).
●
During a sector erase operation
If successive reads are executed during the execution of the chip sector erase algorithm, a flash memory
toggles to output "1" and "0" to addresses alternately at every read access regardless of the location
indicated by the addresses. If successive reads are executed after the chip sector erase algorithm is
completed, the flash memory stops the toggle operation of the bit2 and outputs the read value of the bit2
(DATA: 2) to the location indicated by the address.
Table 28.6-11 Toggle Bit-2 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)
DQ2
1
→
DATA:2
Toggle
→
Stop
Toggle
Toggle
Toggle
DATA:2
Table 28.6-12 Toggle Bit-2 Flag State Transitions (State Change for Abnormal Operation)
Operating state
Write
Chip/sector erase
DQ2
1
*
*: If the DQ5 outputs "1" (exceed the timing limit), successive reads from a writing or erasing sector cause DQ2
to toggle. DQ2 does not toggle when the successive reads are executed from other sectors.
Содержание MB90390 Series
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Страница 17: ...xiii APPENDIX D List of Interrupt Vectors 690 INDEX 695 ...
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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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