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STLUX 数据表(PDF) 36 Page - STMicroelectronics |
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STLUX 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 126 page ![]() I/O multifunction signal configuration STLUX 36/126 DocID027870 Rev 1 Table 6 summarizes the Port P0 configuration scheme. Both registers MSC_IOMXP0 and AFR_IOMXP0 use the same register fields Sel_p054, Sel_p032 and Sel_p010 which respectively control the bits [5, 4], [3, 2] and [1, 0] of the Port P0. 7.2.2 Port P0 diagnostic signals The primary I/Os can be used to trace the SMED's state evolution. This feature allows the debug of the complex SMED configurations. The trace selection can be enabled or disabled via the register MSC_IOMXSMD. The diagnostic signal selection through the MSC_IOMXSMD register overrides the functional configuration of the MSC_IOMXP0 register. The Port P0 [5:3] or P0 [2:0] can be configured to output one or two different SMEDs' current states. The SMEDs FSM state signals (coded on three bits) may be multiplexed either on port bits P0 [5:3] or P0 [2:0]; alternatively two different SMEDs signal states can be traced simultaneously on the same port bits. The SMED trace configuration is forbidden on the Port P [2:0] when the external comparator reference voltage is programmed on the Port P0 [1, 0]. The Port 0 I/O signal availability depends on the STLUX device. Table 6. P0 internal multiplexing signals(1) 1. The Sel_p054, Sel_p032, Sel_p010 are register fields for both registers MSC_IOMXP0 and AFR_IOMXP0. The peripheral conflict (same resources selected on different pins at the same time) has to be prevented by SW configuration. When the I2C interface is selected either on the GPIO0 [5:4] GPIO0 [3:2] or on GPIO0 [1:0] signals the related I/O port speed has to be configured at 10 MHz by programming the GPIO0 internal peripheral. Port P0 multifunction configuration signal Port pins Multifunction signal MUX selection Selection fields Value (binary) P0[1,0](2) 2. Available only on the STLUX385A and STLUX383A. GPIO0 [1] GPIO0 [0] Sel_P010 00 UART_rx UART_tx 01 I2C_scl I2C_sda 10 RFU reserved encoding 11 P0[3,2] GPIO0 [3] GPIO0 [2] Sel_P032 00 I2C_scl I2C_sda 01 HseOscin HseOscout 10 UART_rx UART_tx 11 P0[5,4] GPIO0[5] GPIO0[4] Sel_P054 00 DALI_rx DALI_tx 01 I2C_scl I2C_sda 10 UART_rx UART_tx 11 |
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