| 전자부품 데이터시트 검색엔진 |
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68HC05P9A 데이터시트(PDF) 21 Page - Freescale Semiconductor, Inc |
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68HC05P9A 데이터시트(HTML) 21 Page - Freescale Semiconductor, Inc |
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21 / 90 page ![]() GENERAL RELEASE SPECIFICATION MEMORY Rev. 2.0 2-3 2.1 ROM The user ROM consists of 48 bytes of page zero ROM from $0020 to $004F, 2048 bytes of ROM from $0100 to $08FF, and 16 bytes of user vectors from $1FF0 to $1FFF. The self-check ROM and vectors are located from $1F00 to $1FEF. 2.2 ROM Security Feature A security feature has been incorporated into the MC68HC05P9A to help prevent external reading of code in the ROM. Placing unique customer code at ROM locations $0028-$002F aids in keeping customer developed software proprietary. 2.3 RAM The user RAM consists of 128 bytes of a shared stack area. The stack begins at address $00FF. The stack pointer can access 64 bytes of RAM in the range $00FF to $00C0. NOTE Using the stack area for data storage or temporary work locations requires care to prevent it from being overwritten due to stacking from an interrupt or subroutine call. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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