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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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68HC705SP7 데이터시트(PDF) 37 Page - Freescale Semiconductor, Inc |
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68HC705SP7 데이터시트(HTML) 37 Page - Freescale Semiconductor, Inc |
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37 / 230 page  Memory EPROM MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0 General Release Specification Memory 2.7 EPROM The EPROM is located in two areas of the memory map: • Addresses $0700–$1EFF contain 6144 bytes of user EPROM. • Addresses $1FF0–$1FFF contain 16 bytes of EPROM reserved for user vectors and COP and security register, and the mask option register. 2.8 COP Register As shown in Figure 2-6, a register location is provided at $1FF0 to set the EPROM security1, select the optional features, and reset the COP watchdog timer. The OPT bit controls the function of the PB4 port pin and the availability to add an offset to any measured analog voltages. See 8.5 Analog Status Register for more information 1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or copying the EPROM/OTPROM difficult for unauthorized users. $1FF0 Bit 7 6 54321 Bit 0 Read: EPMSEC OPT Write: COPC = Unimplemented Figure 2-6. COP and Security Register (COPR) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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