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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MC68HC705P9CS датащи(PDF) 37 Page - Freescale Semiconductor, Inc |
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MC68HC705P9CS датащи(HTML) 37 Page - Freescale Semiconductor, Inc |
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37 / 160 page  Memory EPROM/OTPROM MC68HC705P9 — Rev. 4.0 Technical Data MOTOROLA Memory 37 3.6 EPROM/OTPROM An MCU with a quartz window has 2104 bytes of erasable, programmable ROM (EPROM). The quartz window allows EPROM erasure with ultraviolet light. NOTE: Keep the quartz window covered with an opaque material except when programming the MCU. Ambient light may affect MCU operation. In an MCU without the quartz window, the EPROM cannot be erased and serves as 2104 bytes of one-time programmable ROM (OTPROM). The following addresses are user EPROM/OTPROM locations: • $0020–$004F • $0100–$08FF • $1FF8–$1FFF (reserved for user-defined interrupt and reset vectors) The mask option register (MOR) is an EPROM/OTPROM location at address $0900. 3.6.1 EPROM/OTPROM Programming The two ways to program the EPROM/OTPROM are: • Manipulating the control bits in the EPROM programming register to program the EPROM/OTPROM on a byte-by-byte basis • Activating the bootloader ROM to download the contents of an external memory device to the on-chip EPROM/OTPROM Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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