551
CHAPTER 24 512K-BIT FLASH MEMORY
24.9
Flash Security Feature
Flash security feature provides possibilities to protect the content of the flash memory.
■
Abstract
By writing the protection code of "01
H
" to the security bit in the flash memory, access to the flash memory
is restricted. Once the flash memory is protected, performing the chip erase operation only can unlock the
function. Otherwise, read/write access to the flash memory from the external pins is not possible.
This function is suitable for applications requiring security of self-containing and data stored in the flash
memory.
Address of the security bit depends on the size of built-in flash memory. Table 24.9-1 shows the address of
security bit.
■
How to Enable the Flash Security Feature
After writing the protection code "01
H
" to the security bit, the following external reset or power-on enables
the Flash Security Feature.
■
How to Disable the Flash Security Feature
Performing the chip erase operation.
■
Behavior Under the Flash Security Feature
Read operation: invalid data read
Write operation: ignored
■
Others
(1) About configuration of the general-purpose parallel programmer, please follow to the specification of
parallel programmer.
(2) Writing the protection code at the last of flash memory programming is recommended, in order to
prevent the device from enabling the Flash Security Feature accidentally.
Notes:
•
The flash security bit is allocated in the flash memory area. When the protection code "01
H
" is written to
the security bit, it is locked by the security. So, when not using the security function, do not write "01
H
"
to this address.
See Table 24.9-1 for the address of the security bit.
•
By specifying the sector of the flash memory, it cannot be locked the security per sector. It is the
security function for all areas in the flash memory.
•
The FLASH memory trouble in the state to put security cannot be analyzed at all.
Table 24.9-1 Address of Flash Security Bit
Flash memory size
Address of security bit
MB90F362/T(S), MB90F367/T(S)
Built-in 512K-bit flash memory
FF0001
H
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 ...
Page 682: ......