569
CHAPTER 28 3M-BIT FLASH MEMORY
28.6.2
Toggle Bit Flag (DQ6)
Like the data polling flag, the toggle bit flag (DQ6) uses the toggle bit function to post
that the automatic algorithm is being executed or has terminated.
■
Toggle Bit Flag (DQ6)
Table 28.6-5 lists the toggle bit flag state transitions (state change for normal operation) and Table 28.6-6
lists the toggle bit flag state transitions (state change for abnormal operation).
●
Write/chip sector erase
Continuous read-access during execution of the automatic write algorithm and chip/sector erase algorithm
causes the flash memory to toggle the "1" or "0" state for every read cycle, regardless of the value at the
address specified by the address signal. Continuous read-access at the end of the automatic write algorithm
and chip/sector erase algorithm causes the flash memory to stop toggling bit6 and output bit6 (DATA: 6) of
the read value of the address specified by the address signal.
●
Sector erase suspend
Read-access during a sector erase suspend causes the flash memory to output "1" if the address specified by
the address signal belongs to the sector being erased. The flash memory outputs bit6 (DATA: 6) of the read
value at the address specified by the address signal if the address specified by the address signal does not
belong to the sector being erased.
Note:
For a write, if the sector where data is to be written is rewrite-protected, the toggle bit terminates the
toggle operation after approximately 2
μ
s without any data being rewritten. For an erase, if all of the
selected sectors are write-protected, the toggle bit performs toggling for approximately 100
μ
s and
then returns to the read/reset state without any data being rewritten.
Table 28.6-5 Toggle Bit 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)
DQ6
Toggle
→
DATA:6
Toggle
→
Stop
Toggle
Toggle
→
1
1
→
Toggle
DATA:6
Table 28.6-6 Toggle Bit Flag State Transitions (State Change for Abnormal Operation)
Operating state
Write
Chip/sector erase
DQ6
Toggle
Toggle
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 ...
Страница 722: ...694 APPENDIX ...
Страница 723: ...695 INDEX The index follows on the next page This is listed in alphabetic order ...
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