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CHAPTER 28 3M-BIT FLASH MEMORY
28.6
Confirming the Automatic Algorithm Execution State
Because the write/erase flow of the flash memory is controlled using the automatic
algorithm, the flash memory has hardware for posting its internal operating state and
completion of operation. This automatic algorithm enables confirmation of the
operating state of the built-in flash memory using the following hardware sequences.
■
Hardware Sequence Flags
The hardware sequence flags are configured from the five-bit output of DQ7, DQ6, DQ5, DQ3 and DQ2.
The functions of these bits are those of the data polling flag (DQ7), toggle bit flag (DQ6), timing limit
exceeded flag (DQ5), sector erase timer flag (DQ3) and toggle bit-2 flag (DQ2). The hardware sequence
flags can therefore be used to confirm that writing or chip sector erase has been completed or that erase
code write is valid.
The hardware sequence flags can be accessed by read-accessing the addresses of the target sectors in the
flash memory after setting of the command sequence (see Table 28.5-1 in Section "28.5 Starting the Flash
Memory Automatic Algorithm".) Table 28.6-1 lists the bit assignments of the hardware sequence flags.
To determine whether automatic writing or chip sector erase is being executed, the hardware sequence flags
can be checked or the status can be determined from the RDY bit of the flash memory control status
register (FMCS) that indicates whether writing has been completed. After writing/erasing has terminated,
the state returns to the read/reset state. When creating a program, use one of the flags to confirm that
automatic writing/erasing has terminated. Then, perform the next processing operation, such as data read.
In addition, the hardware sequence flags can be used to confirm whether the second or subsequent sector
erase code write is valid. The following sections describe each hardware sequence flag separately. Table
28.6-2 lists the functions of the hardware sequence flags.
Table 28.6-1 Bit Assignments of Hardware Sequence Flags
Bit No.
7
6
5
4
3
2
1
0
Hardware sequence flag
DQ7
DQ6
DQ5
-
DQ3
DQ2
-
-
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 ...
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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 ...
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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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