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HC705V8GRS/D Datasheet(PDF) 128 Page - NXP Semiconductors |
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HC705V8GRS/D Datasheet(HTML) 128 Page - NXP Semiconductors |
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128 / 172 page  SECTION 15: MESSAGE DATA LINK CONTROLLER Page 117 MC68HC705V8 Specification Rev. 2.1 15.5 MDLC MUX INTERFACE The MUX Interface is responsible for bit encoding/decoding and digital noise filtering between the Protocol Handler and the Physical Interface. 15.5.1 Rx DIGITAL FILTER The Receiver section of the MDLC includes a digital low pass filter to remove narrow noise pulses from the incoming message. An outline of the digital filter is shown in the following diagram. Physical Interface To CPU Protocol Handler MUX Interface CPU Interface Rx/Tx Buffers To J1850 Bus MDLC Figure 15-9: MDLC Rx Digital Filter Block 4-Bit Up/Down Counter Data Latch up/down = 15 s q Filtered Rx Data Out MUX Interface Clock Input Sync dq Rx Data from Physical Interface (RxP) = 0 r Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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