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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) 63 Page - Freescale Semiconductor, Inc |
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68HC705SP7 датащи(HTML) 63 Page - Freescale Semiconductor, Inc |
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63 / 230 page  Resets Internal Resets MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0 General Release Specification Resets EPMSEC — EPROM Security1 The EPMSEC bit is a write-only security bit to protect the contents of the user EPROM code stored in locations $0700–$1FFF. OPT — Optional Features The OPT bit enables two additional features: direct drive by comparator 1 output to PB4; and voltage offset capability to sample capacitor in analog subsystem. 1 = Optional features enabled 0 = Optional features disabled COPC — COP Clear COPC is a write-only bit. Periodically writing a logic zero to COPC prevents the COP watchdog from resetting the MCU. Reset clears the COPC bit. 1 = No effect on COP watchdog timer 0 = Reset COP watchdog timer The COP watchdog reset will assert the pulldown device to pull the RESET pin low for three to four cycles of the internal bus. The COP watchdog reset function can be enabled or disabled by programming the COPEN bit in the MOR. 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 654321 Bit 0 Read: EPMSEC OPT Write: COPC Reset: U UUUUUUU = Unimplemented U = Unaffected Figure 5-2. COP and Security Register (COPR) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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