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TMP139AIYAHT Datasheet(PDF) 38 Page - Texas Instruments |
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TMP139AIYAHT Datasheet(HTML) 38 Page - Texas Instruments |
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38 / 58 page  7.6.7 MR18: Device Configuration (address = 12h) [reset = 00h] The MR18 register is used to configure the device features. In I3C mode, it allows the PEC to be enabled and Parity (T-bit) to be disabled. It also controls the default read address mode for both I2C and I3C bus operations. The burst length for the PEC byte is allowed only in I3C mode and the host controller must not update the bit in the I2C mode of operation. Return to Register Map. Figure 7-53. MR18: Device Configuration Register 7 6 5 4 3 2 1 0 PEC_EN PAR_DIS INF_SEL DEF_RD_ADDR _POINT_EN DEF_RD_ADDR_POINT_Star t[1:0] DEF_RD_ADDR_ POINT_BL Reserved RW-0 RW-0 R-0 RW-0 RW-0 RW-0 R-0 Table 7-19. MR18: Device Configuration Field Descriptions Bit Field Type Reset Description 7 PEC_EN RW 0 PEC enable1 0 = PEC is disabled 1 = PEC is enabled 6 PAR_DIS RW 0 Parity (T-bit) disable1 0 = Parity or T-bit is enabled 1 = Parity or T-bit is disabled 5 INF_SEL R 0 Interface selection 0 = I2C protocol (maximum speed of 1 MHz) 1 = I3C basic protocol 4 DEF_RD_ADDR_POINT_EN RW 0 Default read address pointer enable 0 = Disable default read address pointer (address pointer is set by host) 1 = Enable default read address pointer (address selected by MR7 register, DEF_RD_ADDR_POINT_Start[1:0] bits 3:2 DEF_RD_ADDR_POINT_Start[1:0] RW 00 Default read address pointer starting address2 00 = MR49 register 01 = Reserved 10 = Reserved 11 = Reserved 1 DEF_RD_ADDR_POINT_BL RW 0 Burst length for read pointer address for PEC calculation 0 = 2 bytes 1 = 4 bytes 0 Reserved R 0 Reserved 1. PEC enable and parity disable are automatically updated when RSTDAA CCC is issued on the bus or a bus reset sequence is applied. 2. Setting any of the reserved values shall result in unpredictable behavior from TMP139. Note Any host transaction which results in write or update to MR18 register must be immediately followed by a Stop condition. A Repeated Start may result in unpredictable behavior. TMP139 SNIS217 – DECEMBER 2020 www.ti.com 38 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TMP139 |
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