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STV3550 Datasheet(PDF) 98 Page - STMicroelectronics |
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STV3550 Datasheet(HTML) 98 Page - STMicroelectronics |
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98 / 144 page ![]() 98/144 STV3550 The SSC2 can also be configured to loop the serial_data_out back to serial_data_in in order to test the device without any external connections. This is described in Section 7.7.10: Loopback Mode. The SSC2 can be turned on and off by setting the enable control. This is described in Section 7.7.11: Enabling Operation. The SSC2 can be set to operate as a bus master or as a bus slave device. This is described in Section 7.7.12: Master/Slave Operation. The SSC2 generates interrupts in a variety of situations: when the transmission buffer is empty, when the receive buffer is full and when an error occurs. A number of error conditions are detected. These are described in Section 7.7.13: Error Detection. 7.7.3 PIO Pad Connection & Control In I²C mode, only the SDA pad will be used as an input and output. The SDA and SCL pads are provided by 2 bits of a standard ST20 PIO block. Their directions (input, output or bidirectional) can therefore be configured in software using the appropriate PIO settings. Consequently the SSC2 does not need to provide automatic control of data pad directions and does not need to provide a bidirectional clock port. Figure 62: Basic SSC2 Architecture Clock Edge Detector Shift Register Transmit Receive Peripheral Interface SERIAL_CLOCK_IN SERIAL_DATA_IN SERIAL_DATA_OUT SERIAL_CLOCK_OUT Loopback Control Enable Control Pin Control SERIAL_DATA_IN SERIAL_DATA_OUT Master/Slave Select Buffer Buffer PER_INTERRUPT, INT_ERROR INT_TIR, INT_RIR Clock Generator & Control |
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