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TMP1827 Scheda tecnica(PDF) 42 Page - Texas Instruments |
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TMP1827 Scheda tecnica(HTML) 42 Page - Texas Instruments |
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42 / 68 page ![]() RST ATR FLEXADDR 1-BYTE FLEX ADDRESS DEVICE- 1 0Fh GPIO READ CRC F5h DEVICE SENDS GPIO BYTE RST ATR FLEXADDR 1-BYTE FLEX ADDRESS DEVICE- 2 0Fh GPIO READ CRC F5h DEVICE SENDS GPIO BYTE CRC DEVICE SENDS GPIO BYTE RST ATR FLEXADDR 1-BYTE FLEX ADDRESS DEVICE- 3 0Fh GPIO READ CRC F5h DEVICE SENDS GPIO BYTE CRC DEVICE SENDS GPIO BYTE Figure 8-30. Multiple Device GPIO Read Flow 8.5.7 Multiple Device IO Write and Read Figure 8-31 shows the program flow that the host MCU must execute for configuring the and reading the IO from a device. The host selects the device it wants to communicate with and issues the GPIO WRITE function. The host shall then send the IO configuration register followed by an inverted value, that allows the device to check for any bus transmission error. If the host receives a return code any other than AAh, it must terminate the transaction by sending a bus reset. When the host gets the return code of AAh from the device, it shall wait for the device to sample the bus and then read back the IO read register along with a CRC. If the host plans to read the device continuously, then it must send a bus reset and initiate a GPIO READ function. RST ATR FLEXADDR 1-BYTE FLEX ADDRESS 0Fh GPIO WRITE GPIO CONFIG BYTE A5h GPIO CONFIG BYTE CRC DEVICE RETURN CODE DEVICE SENDS GPIO BYTE AAh RST ATR FLEXADDR 1-BYTE FLEX ADDRESS 0Fh GPIO WRITE GPIO CONFIG BYTE A5h GPIO CONFIG BYTE CRC DEVICE RETURN CODE DEVICE SENDS GPIO BYTE AAh Figure 8-31. Multiple Device GPIO Write and Read Flow TMP1827 SBOSA15 – SEPTEMBER 2022 www.ti.com 42 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: TMP1827 |
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