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HC705RC16GRS/D Datasheet(PDF) 28 Page - NXP Semiconductors |
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HC705RC16GRS/D Datasheet(HTML) 28 Page - NXP Semiconductors |
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28 / 120 page  Memory General Release Specification MC68HC705RC16 — Rev. 3.0 Memory 2.3.1 EPROM The user EPROM consists of 15,936 bytes of EPROM from $0180 to $3FAF and 14 bytes of user vectors from $3FF2 to $3FFF. The bootloader ROM and vectors are located from $3FB0 to $3FEF. Ten of the user vectors, $3FF6 thorough $3FFF, are dedicated to reset and interrupt vectors. The four remaining locations, $3FF2–$3FF5 are general-purpose user EPROM locations. The mask option registers (MOR1 and MOR2) are located at $3FF0 and $3FF1. 2.3.2 EPROM Security The MC68HC705RC16 contains special circuitry to prevent accessing the EPROM in nonuser mode. Emulation is not affected by security. Security is controlled by a security bit in the MOR1 register. The security bit is intended to be programmed while the code is being programmed.. When set, this will inhibit reading of the EPROM in all modes other than user mode.1 1. No security feature is absolutely secure. However, Motorola’s strategy is to make reading or copying the ROM difficult for unauthorized users. $001A Reserved R RRRRRRR $001B Reserved R RRRRRRR $001C Reserved R RRRRRRR $001D Reserved R RRRRRRR $001E Reserved R RRRRRRR $001F Reserved R RRRRRRR R = Reserved Addr. Register Bit 7 6 5 4 3 2 1 Bit 0 Figure 2-2. I/O Registers (Continued) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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