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M68HC05 Datasheet(PDF) 28 Page - Freescale Semiconductor, Inc |
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M68HC05 Datasheet(HTML) 28 Page - Freescale Semiconductor, Inc |
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28 / 118 page  Memory MC68HC05C9A Advance Information Data Sheet, Rev. 4.1 28 Freescale Semiconductor 2.4 EPROM Security A security feature has been incorporated into the MC68HC705C9A to help prevent external access to the contents of the EPROM in any mode of operation. Once enabled, this feature can be disabled only by completely erasing the EPROM. NOTE For OTP (plastic) packages, once the security feature has been enabled, it cannot be disabled. 2.5 ROM The bootloader ROM occupies 239 bytes in the memory space from $3F00 to $3FEF. The bootloader mode provides for self-programming of the EPROM array. See Appendix A EPROM Programming. 2.6 I/O Registers Except for the option register, mask option registers, and the C12 COP clear register, all I/O, control and status registers are located within one 32-byte block in page zero of the address space ($0000–$001F). A summary of these registers is shown in Figure 2-3. More detail about the contents of these registers is given Figure 2-4. |
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