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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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HD64F2149YV 数据表(PDF) 721 Page - Renesas Technology Corp |
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HD64F2149YV 数据表(HTML) 721 Page - Renesas Technology Corp |
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721 / 1075 page  Section 22 ROM Rev. 3.00 Jan 18, 2006 page 693 of 1044 REJ09B0280-0300 On-Board Programming Modes • Boot mode Flash memory The chip RAM Host Programming control program SCI Application program (old version) Programming control program New application program New application program Flash memory The chip RAM Host SCI Application program (old version) Boot program area Programming control program New application program Flash memory The chip RAM Host SCI Flash memory erase Boot program Flash memory The chip Program execution state RAM Host SCI New application program Boot program 1. Initial state The flash memory is in the erased state when the device is shipped. The description here applies to the case where the old program version or data is being rewritten. 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 the chip (originally incorporated in the chip) is started, an SCI communication check is carried out, and 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, entire flash memory erasure is performed, without regard to blocks. 4. Writing new application program The programming control program transferred from the host to RAM by SCI communication is executed, and the new application program in the host is written into the flash memory. Boot program Boot program Boot program area Programming control program Boot program area Programming control program Figure 22.4 Boot Mode |
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