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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HC705RC17GRS/D 데이터시트(PDF) 34 Page - NXP Semiconductors |
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HC705RC17GRS/D 데이터시트(HTML) 34 Page - NXP Semiconductors |
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34 / 126 page  Central Processor Unit (CPU) General Release Specification MC68HC705RC17 — Rev. 2.0 Central Processor Unit (CPU) Negative (N) When set, this bit indicates that the result of the last arithmetic, logical, or data manipulation was negative. Zero (Z) When set, this bit indicates that the result of the last arithmetic, logical, or data manipulation was zero. Carry/Borrow (C) When set, this bit indicates that a carry or borrow out of the arithmetic logical unit (ALU) occurred during the last arithmetic operation. This bit is also affected during bit test and branch instructions and during shifts and rotates. 3.7 Stack Pointer The stack pointer (SP) contains the address of the next free location on the stack. During an MCU reset or the reset stack pointer (RSP) instruction, the stack pointer is set to location $00FF. The stack pointer is then decremented as data is pushed onto the stack and incremented as data is pulled from the stack. When accessing memory, the eight most significant bits are permanently set to 00000011. These eight bits are appended to the six least significant register bits to produce an address within the range of $00FF to $00C0. Subroutines and interrupts may use up to 64 (decimal) locations. If 64 locations are exceeded, the stack pointer wraps around and loses the previously stored information. A subroutine call occupies two locations on the stack; an interrupt uses five locations. 13 7 0 00000011 SP Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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