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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) 185 Page - Freescale Semiconductor, Inc |
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68HC705SP7 датащи(HTML) 185 Page - Freescale Semiconductor, Inc |
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185 / 230 page  EPROM/OTPROM EPROM Programming MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0 General Release Specification EPROM/OTPROM addresses $1FF0–$1FFF which includes the mask option register at address $1FF1, and the security bit at address $1FF0. NOTE: To program the EPROM/OTPROM, MOR or EPMSEC bits properly, the VDD voltage must be greater than 4.5 volts. 13.4.1 MOR Programming The contents of the MOR should be programmed using the programmer board. To program any bits in the MOR, the desired bit states must be written to the MOR address and then the MPGM bit in the EPROG register must be used. The following sequence will program the MOR: 1. Write the desired data to the MOR location ($1FF1). 2. Apply the programming voltage to the IRQ/VPP pin. 3. Set the MPGM bit in the EPROG. 4. Wait for the programming time, tMPGM. 5. Clear the MPGM bit in the EPROG. 6. Remove the programming voltage from the IRQ/VPP pin. Once the MOR bits have been programmed, some of the options may experience glitches in operation after removal of the programming voltage. It is recommended that the part be reset before trying to verify the contents of the user EPROM or the MOR itself. NOTE: The contents of the EPROM or the MOR cannot be accessed if the EPMSEC bit in the COP register has been set. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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