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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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68HC705SP7 датащи(PDF) 177 Page - Freescale Semiconductor, Inc |
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68HC705SP7 датащи(HTML) 177 Page - Freescale Semiconductor, Inc |
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177 / 230 page  Personality EPROM PEPROM Erasing MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0 General Release Specification Personality EPROM Reading the PEPROM is easiest when each PEPROM column contains one byte. Selecting a row 0 bit selects the first bit, and incrementing the PEPROM bit select register (PEBSR) selects the next bit in row 1 from the same column. Incrementing PEBSR seven more times selects the remaining bits of the column and ends up selecting the bit in row 0 of the next column, thereby setting the row 0 flag, PEPRZF. NOTE: A PEPROM byte that has been read can be transferred to the personality EPROM bit select register (PEBSR) as a temporary storage location such that subsequent reads of the PEBSR quickly yield that PEPROM byte. 12.6 PEPROM Erasing MCUs with windowed packages permit PEPROM erasure with ultraviolet light. Erase the PEPROM by exposing it to 15 Ws/cm2 of ultraviolet light with a wavelength of 2537 angstroms. Position the ultraviolet light source 1 inch from the window. Do not use a shortwave filter. The erased state of a PEPROM bit is a logic zero. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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