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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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HC705RC17GRS/D bảng dữ liệu(PDF) 75 Page - NXP Semiconductors |
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HC705RC17GRS/D bảng dữ liệu(HTML) 75 Page - NXP Semiconductors |
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75 / 126 page  Carrier Modulator Transmitter (CMT) Modulator MC68HC705RC17 — Rev. 2.0 General Release Specification Carrier Modulator Transmitter (CMT) 9.5.2 FSK Mode When the modulator operates in FSK mode, the modulation mark and space periods consist of an integer number of carrier clocks (space period can be zero). When the mark period expires, the space period is transparently started (as in time mode); however, in FSK mode the carrier switches between data registers in preparation for the next mark period. The carrier generator toggles between primary and secondary data register values whenever the modulator mark period expires. The space period provides an interpulse gap (no carrier), but if SBUFF = 0, then the modulator and carrier generator will switch between carrier frequencies without a gap or any carrier glitches (zero space). Using timing data for carrier burst and interpulse gap length calculated by the CPU, FSK mode automatically can generate a phase-coherent, dual-frequency FSK signal with programmable burst and interburst gaps. The mark and space time equations for FSK mode are: Where fcg is the frequency output from the carrier generator, setting the DIV2 bit in the MCSR will double mark and space times. tmark MBUFF 1 + fcg ------------------------------- s sec = tspace SBUFF fcg ---------------------s sec = Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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