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SH7014 Datasheet(PDF) 527 Page - Renesas Technology Corp |
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SH7014 Datasheet(HTML) 527 Page - Renesas Technology Corp |
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527 / 754 page ![]() 18. 128 kB Flash Memory (F-ZTAT) Rev.5.00 Sep. 27, 2007 Page 493 of 716 REJ09B0398-0500 User Program Mode Flash memory SH7017 RAM Host Programming/ erase control program SCI Boot program New application program Flash memory SH7017 RAM Host SCI New application program Flash memory SH7017 RAM Host SCI Flash memory erase Boot program New application program Flash memory SH7017 Program execution state RAM Host SCI Boot program Boot program FWP assessment program Application program (old version) New application program 1. Initial state The FWP assessment program that confirms that user program mode has been entered, and the program that will transfer the programming/erase control program from flash memory to on-chip RAM should be written into the flash memory by the user beforehand. The programming/erase control program should be prepared in the host or in the flash memory. 2. Programming/erase control program transfer When user program mode is entered, user software confirms this fact, executes transfer program in the flash memory, and transfers the programming/erase control program to RAM. 3. Flash memory initialization The programming/erase program in RAM is executed, and the flash memory is initialized (to H'FF). Erasing can be performed in block units, but not in byte units. 4. Writing new application program Next, the new application program in the host is written into the erased flash memory blocks. Do not write to unerased blocks. Programming/ erase control program Programming/ erase control program Programming/ erase control program Transfer program Application program (old version) Transfer program FWP assessment program FWP assessment program Transfer program FWP assessment program Figure 18.4 User Program Mode |
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