RL78/D1A User's Manual: Hardware - Renesas

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Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 28 FLASH MEMORY The following figure illustrates a flow of rewriting the flash memory by using a self programming library. Figure 28-10. Flow of Self Programming (Rewriting Flash Memory) Flash memory control start Initialize flash environment Flash shield window setting Erase Write Verify Flash information getting Flash information setting Close flash environment End Inhibit access to flash memory Inhibit shifting STOP mode Inhibit clock stop R01UH0317EJ0004 Rev. 0.04 1179 Feb. 22, 2013
Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 28 FLASH MEMORY 28.7.1 Boot swap function If rewriting the boot area failed by temporary power failure or other reasons, restarting a program by resetting or overwriting is disabled due to data destruction in the boot area. The boot swap function is used to avoid this problem. Before erasing boot cluster 0 Note , which is a boot program area, by self-programming, write a new boot program to boot cluster 1 in advance. When the program has been correctly written to boot cluster 1, swap this boot cluster 1 and boot cluster 0 by using the set information function of the firmware of the RL78/D1A, so that boot cluster 1 is used as a boot area. After that, erase or write the original boot program area, boot cluster 0. As a result, even if a power failure occurs while the boot programming area is being rewritten, the program is executed correctly because it is booted from boot cluster 1 to be swapped when the program is reset and started next. XXXXXH Note A boot cluster is a 8 KB area and boot clusters 0 and 1 are swapped by the boot swap function. 04000H 02000H 00000H User program User program Boot program (boot cluster 0) Self-programming to boot cluster 1 Figure 28-11. Boot Swap Function User program New boot program (boot cluster 1) Execution of boot swap by firmware User program Boot program (boot cluster 0) Self-programming to boot cluster 0 User program New user program (boot cluster 0) Boot program New boot program New boot program (boot cluster 0) (boot cluster 1) (boot cluster 1) Boot Boot Boot Boot In an example of above figure, it is as follows. Boot cluster 0: Boot program area before boot swap Boot cluster 1: Boot program area after boot swap R01UH0317EJ0004 Rev. 0.04 1180 Feb. 22, 2013
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User’s Manual 16 RL78/D1A 16-Bit
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NOTES FOR CMOS DEVICES (1) VOLTAGE
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Conventions Data significance: High
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CONTENTS CHAPTER 1 OUTLINE.........
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3.4.4 Short direct addressing .....
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6.8 Operation of Plural Channels of
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12.5.3 Master transmission/receptio
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19.2 Configuration of DMA Controlle
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28.1.1 Programming Environment.....
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34.2 64-pin products 1276 R5F10CLDx
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RL78/D1A User’s Manual: Hardware
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