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CHAPTER 24 512K-BIT FLASH MEMORY
24.7.2
Writing Data
This section describes the procedure for issuing the Write command to write data to the
flash memory.
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Writing Data to the Flash Memory
The data write automatic algorithm of the flash memory can be started by sending the Write command in
the command sequence table (see Table 24.5-1 ) continuously to the target sector in the flash memory.
When data write to the target address is completed in the fourth cycle, the automatic algorithm and
automatic write are started.
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Specifying addresses
Only even addresses can be specified as the write addresses specified in a write data cycle. Odd addresses
cannot be written correctly. That is, writing to even addresses must be done in units of word data.
Writing can be done in any order of addresses. However, the Write command writes only data of one word
for each execution.
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Notes on writing data
Writing cannot return data 0 to data 1. When data 1 is written to data 0, the data polling algorithm (DQ7) or
toggle operation (DQ6) does not terminate and the flash memory elements are determined to be faulty. If
the time prescribed for writing is thus exceeded, the timing limit exceeded flag (DQ5) is determined to be
an error. Otherwise, the data is viewed as if dummy data 1 had been written. However, when data is read in
the read/reset state, the data remains 0. Data 0 can be set to data 1 only by erase operations.
All commands are ignored during execution of the automatic write algorithm. If a hardware reset is started
during writing, the data of the written addresses will be unpredictable.
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Writing to the Flash Memory
Figure 24.7-1 is an example of the procedure for writing to the flash memory. The hardware sequence flags
(see "24.6 Confirming the Automatic Algorithm Execution State") can be used to determine the state of the
automatic algorithm in the flash memory. Here, the data polling flag (DQ7) is used to confirm that writing
has terminated.
The data read to check the flag is read from the address written to last.
The data polling flag (DQ7) changes at the same time that the timing limit exceeded flag (DQ5) changes.
For example, even if the timing limit exceeded flag (DQ5) is 1, the data polling flag bit (DQ7) must be
rechecked.
Also for the toggle bit flag (DQ6), the toggle operation stops at the same time that the timing limit
exceeded flag bit (DQ5) changes to 1. The toggle bit flag (DQ6) must therefore be rechecked.
Summary of Contents for F2MCTM-16LX
Page 2: ......
Page 3: ...FUJITSU LIMITED F2MCTM 16LX 16 BIT MICROCONTROLLER MB90360 Series HARDWARE MANUAL ...
Page 4: ......
Page 42: ...26 CHAPTER 1 OVERVIEW ...
Page 70: ...54 CHAPTER 2 CPU ...
Page 134: ...118 CHAPTER 6 CLOCK SUPERVISOR ...
Page 176: ...160 CHAPTER 8 LOW POWER CONSUMPTION MODE ...
Page 194: ...178 CHAPTER 10 I O PORTS ...
Page 252: ...236 CHAPTER 13 16 Bit I O TIMER ...
Page 282: ...266 CHAPTER 14 16 BIT RELOAD TIMER ...
Page 296: ...280 CHAPTER 15 WATCH TIMER ...
Page 386: ...370 CHAPTER 18 8 10 BIT A D CONVERTER ...
Page 426: ...410 CHAPTER 20 LIN UART Figure 20 5 2 ORE Flag Set Timing RDRF ORE Reception data ...
Page 540: ...524 CHAPTER 22 ADDRESS MATCH DETECTION FUNCTION ...
Page 568: ...552 CHAPTER 24 512K BIT FLASH MEMORY ...
Page 633: ...617 APPENDIX B Instructions Table B 9 3 Bit Operation Instruction Map first byte 6CH ...
Page 634: ...618 APPENDIX Table B 9 4 Character String Operation Instruction Map first byte 6EH ...
Page 637: ...621 APPENDIX B Instructions Table B 9 7 ea Instruction 2 first byte 71H ...
Page 638: ...622 APPENDIX Table B 9 8 ea Instruction 3 first byte 72H ...
Page 639: ...623 APPENDIX B Instructions Table B 9 9 ea Instruction 4 first byte 73H ...
Page 640: ...624 APPENDIX Table B 9 10 ea Instruction 5 first byte 74H ...
Page 641: ...625 APPENDIX B Instructions Table B 9 11 ea Instruction 6 first byte 75H ...
Page 642: ...626 APPENDIX Table B 9 12 ea Instruction 7 first byte 76H ...
Page 643: ...627 APPENDIX B Instructions Table B 9 13 ea Instruction 8 first byte 77H ...
Page 644: ...628 APPENDIX Table B 9 14 ea Instruction 9 first byte 78H ...
Page 645: ...629 APPENDIX B Instructions Table B 9 15 MOVEA RWi ea Instruction first byte 79H ...
Page 646: ...630 APPENDIX Table B 9 16 MOV Ri ea Instruction first byte 7AH ...
Page 647: ...631 APPENDIX B Instructions Table B 9 17 MOVW RWi ea Instruction first byte 7BH ...
Page 648: ...632 APPENDIX Table B 9 18 MOV Ri ea Instruction first byte 7CH ...
Page 649: ...633 APPENDIX B Instructions Table B 9 19 MOVW ea Rwi Instruction first byte 7DH ...
Page 650: ...634 APPENDIX Table B 9 20 XCH Ri ea Instruction first byte 7EH ...
Page 651: ...635 APPENDIX B Instructions Table B 9 21 XCHW RWi ea Instruction first byte 7FH ...
Page 664: ...648 APPENDIX ...
Page 665: ...649 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
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