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HC705RC17GRS/D Datasheet(PDF) 28 Page - NXP Semiconductors |
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HC705RC17GRS/D Datasheet(HTML) 28 Page - NXP Semiconductors |
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28 / 126 page  Memory General Release Specification MC68HC705RC17 — Rev. 2.0 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 $0020 to $00AF and $0100 to $170 in boot mode only, and from $3FB0 to $3FEF in both boot mode and burn-in mode. Ten of the user vectors, $3FF6 thorough $3FFF, are dedicated to reset and interrupt vectors. The four remaining locations, $3FF2 through $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 MC68HC705RC17 contains special circuitry to prevent accessing the EPROM in non-user mode. Emulation will not be affected by this change. Security is controlled by a security bit in the MOR register. It is intended to be programmed while the users are programming their code. This will inhibit reading of the EPROM in all modes other than user mode. $18 Reserved R R R R R R R R $19 Reserved R R R R R R R R $1A Reserved R R R R R R R R $1B Reserved R R R R R R R R $1C Reserved R R R R R R R R $1D Reserved R R R R R R R R $1E Reserved R R R R R R R R $1F Reserved R R R R R R R R R = Reserved Addr Register Name Bit 7 6 5 4 3 2 1 Bit 0 Figure 2-2. I/O Registers (Sheet 2 of 2) Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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