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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8S/2218 数据表(PDF) 604 Page - Renesas Technology Corp |
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H8S/2218 数据表(HTML) 604 Page - Renesas Technology Corp |
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604 / 750 page  Section 17 Flash Memory (F-ZTAT Version) Rev.6.00 Jun. 03, 2008 Page 556 of 698 REJ09B0074-0600 Flash memory This LSI RAM Host Programming control program Application program (old version) New application program Flash memory This LSI RAM Host Application program (old version) Boot program area New application program Flash memory This LSI RAM Host Flash memory preprogramming erase Boot program New application program Flash memory This LSI Program execution state RAM Host New application program Boot program Programming control program 1. Initial state The old program version or data remains written in the flash memory. The user should prepare the programming control program and new application program beforehand in the host. 2. Programming control program transfer When boot mode is entered, the boot program in this LSI (originally incorporated in the chip) is started and the programming control program in the host is transferred to RAM via SCI or USB communication. The boot program required for flash memory erasing is automatically transferred to the RAM boot program area. 3. Flash memory initialization The erase program in the boot program area (in RAM) is executed, and the flash memory is initialized (to H'FF). In boot mode, total flash memory erasure is performed, without regard to blocks. 4. Writing new application program The programming control program transferred from the host to RAM is executed, and the new application program in the host is written into the flash memory. Programming control program Boot program Boot program Boot program area Boot program area Programming control program SCI or USB SCI or USB SCI or USB SCI or USB Figure 17.3 Boot Mode (Sample) |
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