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HC705E5GRS/D Datasheet(PDF) 74 Page - NXP Semiconductors |
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HC705E5GRS/D Datasheet(HTML) 74 Page - NXP Semiconductors |
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74 / 148 page  Motorola Bus (M Bus) Interface General Release Specification MC68HC705E5 — Rev. 1.0 Motorola Bus (M Bus) Interface 11.5.1 Start Signal When the bus is free (for example, no master device is engaging the bus and both SCL and SDA lines are at logical high), a master may initiate communication by sending a start signal. As shown in Figure 11-1, a start signal is defined as a high-to-low transition of SDA while SCL is high. This signal denotes the beginning of new data transfer (each data transfer may contain several bytes of data) and wakes up all slaves. Figure 11-1. M-Bus Transmission Signal Diagram 10 0 101 01 0 10 11 1 00 NO ACKNOWLEDGE MSB MSB LSB SDA SCL START SIGNAL STOP SIGNAL LSB ACKNOWLEDGE BIT 10 0 101 01 0 10 11 1 00 NO ACKNOWLEDGE MSB MSB LSB SDA SCL START SIGNAL STOP SIGNAL LSB ACKNOWLEDGE BIT REPEATED START SIGNAL Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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