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MC68HC908JL3ECP Datasheet(PDF) 46 Page - Motorola, Inc |
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MC68HC908JL3ECP Datasheet(HTML) 46 Page - Motorola, Inc |
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46 / 226 page  FLASH Memory (FLASH) Technical Data MC68H(R)C908JL3E/JK3E/JK1E — Rev. 2.0 46 FLASH Memory (FLASH) MOTOROLA 4.5 FLASH Page Erase Operation Use the following procedure to erase a page of FLASH memory. A page consists of 64 consecutive bytes starting from addresses $XX00, $XX40, $XX80 or $XXC0. The 48-byte user interrupt vectors area also forms a page. Any page within the 4K bytes user memory area ($EC00–$FBFF) can be erased alone. The 48-byte user interrupt vectors cannot be erased by the page erase operation because of security reasons. Mass erase is required to erase this page. 1. Set the ERASE bit and clear the MASS bit in the FLASH Control Register. 2. Write any data to any FLASH address within the page address range desired. 3. Wait for a time, tnvs (10µs). 4. Set the HVEN bit. 5. Wait for a time tErase (1ms). 6. Clear the ERASE bit. 7. Wait for a time, tnvh (5µs). 8. Clear the HVEN bit. 9. After time, trcv (1µs), the memory can be accessed in read mode again. NOTE: Programming and erasing of FLASH locations cannot be performed by code being executed from the FLASH memory. While these operations must be performed in the order as shown, but other unrelated operations may occur between the steps. |
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