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AN610 Datasheet(PDF) 57 Page - Silicon Laboratories |
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AN610 Datasheet(HTML) 57 Page - Silicon Laboratories |
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57 / 71 page  AN610 Rev. 0.3 57 To send the ATDD_POWER_UP command and arguments, the system controller sends the START condition, followed by the 8-bit control word, which consists of a seven-bit device address (0010001b) and the write bit (0b) indicated by ADDR+W = 00100010b = 0x22. The device acknowledges the control word by setting SDIO = 0, indicated by ACK = 0. The system controller then sends the CMD byte, 0xE1, and again the device acknowledges by setting ACK = 0. The system controller and device repeat this process for the ARG1, ARG2, ARG3, ARG4, ARG5, and ARG6 bytes. Commands may take up to seven argument bytes, and this flexibility should be designed into the 2-wire bus mode implementation. Alternatively, all seven argument bytes may be sent for all commands, but unusual arguments must be 0x00. Unpredictable device behavior will result if more than seven arguments are sent. To read the status and response from the device, the system controller sends the START condition, followed by the eight-bit control word, which consists of the seven bit device address and the read bit (1b) (i.e., the write control word is ADDR+R = 00100011b = 0x23). The device acknowledges the control word by setting ACK = 0. Next the system controller reads the STATUS byte. In this example, the STATUS byte is 0x00, indicating that the CTS bit, bit 8, has not been set. The response bytes are not ready for reading and that the device is not ready to accept another command. The system controller sets SDIO = 1, indicated by NACK = 1, to signal to the device the 2-wire transfer will end. The system controller should set the STOP condition. This process is repeated until the STATUS byte indicates that CTS bit is set, 0x80 in this example. When the STATUS byte returns CTS bit set, 0x80 in this example, the system controller may read the response bytes from the device. The controller sets ACK = 0 to indicate to the device that additional bytes will be read. The RESP1 byte is read by the system controller, followed by the system controller setting ACK = 0. This is repeated for RESP2. RESP3 is read by the system controller followed by the system controller setting NACK = 1, indicating that RESP3 is the last byte to be read. The system controller then sets the STOP condition. Responses may be up to 15 bytes in length (RESP1–RESP15) depending on the command. It is acceptable to read all 15 response bytes. However, unused response bytes return random data and must be ignored. Note that the ATDD_POWER_UP command returns only the STATUS byte and response bytes are shown only for completeness. START ADDR+W ACK CMD ACK ARG1 ACK … ARG6 ACK STOP START 0x22 00xE1 00x080 0 … 0x0A 0STOP START ADDR+R ACK STATUS NACK STOP START 0x23 0 0x00 1 STOP START ADDR+R STATUS ACK RESP1 ACK RESP2 ACK RESP3 NACK STOP START 0x23 0x80 0 0x00 0 0x00 0 0x00 1 STOP |
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