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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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MC68HC705MC4MP bảng dữ liệu(PDF) 36 Page - Freescale Semiconductor, Inc |
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MC68HC705MC4MP bảng dữ liệu(HTML) 36 Page - Freescale Semiconductor, Inc |
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36 / 180 page  Central Processing Unit MC68HC705MC4 — Rev. 2.0 Central Processing Unit 3.3 Accumulator The accumulator (A) is a general-purpose 8-bit register used to hold operands and results of arithmetic calculations or data manipulations. 3.4 Index Register The index register (X) is an 8-bit register used for the indexed addressing value to create an effective address. The index register also may be used as a temporary storage area. 3.5 Condition Code Register The condition code register (CCR) is a 5-bit register in which four bits are used to indicate the results of the instruction just executed, and the fifth bit indicates whether interrupts are masked. These bits can be tested individually by a program, and specific actions can be taken as a result of their state. Each bit is explained in the following paragraphs. H — Half Carry This bit is set during ADD and ADC operations to indicate that a carry occurred between bits 3 and 4. I — Interrupt When this bit is set, timer and external interrupts are masked (disabled). If an interrupt occurs while this bit is set, the interrupt is latched and processed as soon as the interrupt bit is cleared. 70 A 70 X CCR HIN Z C Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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