Supported Platforms: SOMRT1061

Open all serial ports on SOMRT1061 Platform

There can be a maximum of 7 serial port configured on the device. Note that each signal pin on the microprocessor can be configured for up to 5 different functions, so to achieve the maximum number of serial ports some functions/ peripherals will be unavailable.

Serial Port Pin Number Peripheral Mode LPUART Comments for use with DEV-S61-100CR

0 TX 8 2 LPUART 3 TX 0 RX 7 2 LPUART 3 RX 0 CTS 6 2 LPUART 3 CTS 0 RTS 4 2 LPUART 3 RTS Note: Serial port 0 is stdio by default

1 TX 42 2 LPUART 2 TX 1 RX 43 2 LPUART 2 RX Connected to GND through 0.1uF cap. High bus speed not recommended. 1 CTS 40 2 LPUART 2 CTS 1 RTS 41 2 LPUART 2 RTS Connected to GND through 0.1uF cap. High bus speed not recommended.

2 TX 88 2 LPUART 4 TX 2 RX 87 2 LPUART 4 RX 2 CTS 3 2 LPUART 4 CTS 2 RTS 2 2 LPUART 4 RTS

3 TX 86 2 LPUART 5 TX Shares trace with RTC CLK OUT. Cannot be used if RTC clock output is enabled (not enabled by default). 3 RX 85 2 LPUART 5 RX Shares trace with NBWIFI enable pin. Cannot be used simultaneously with NBWIFI. 3 CTS 81 2 LPUART 5 CTS Shares trace with RGB blue LED. High bus speed not recommended. 3 RTS 82 2 LPUART 5 RTS Shares trace with RGB green LED. High bus speed not recommended.

4 TX 84 2 LPUART 6 TX Only supports RS485. 4 RX 83 2 LPUART 6 RX Only supports RS485. 4 CTS 78 2 LPUART 6 CTS Only supports RS485. Shares trace with LED0. High bus speed not recommended. 4 RTS 80 2 LPUART 6 RTS Only supports RS485.

5 TX 77 2 LPUART 7 TX Shares trace with RGB red LED. HIGH bus speed not recommended. 5 RX 76 2 LPUART 7 RX Shares trace with Enet 2. Ethernet driver source modifications can be made for testing while not mounted in DEV-S61-100CR WARNING: LPUART7 RX cannot be used while mounted in the DEV-S61-100CR

6 TX 29 2 LPUART 8 TX Shares trace with SDHC (PIN_29_USDHC1_DATA2). Trace pulled high with 47k resistor. High bus speed not recommended. Cannot be used with SD card is mounted. 6 RX 28 2 LPUART 8 RX Shares trace with SDHC (PIN_28_USDHC1_DATA3). Trace pulled high with 47k resistor. High bus speed not recommended. Cannot be used with SD card is mounted. 6 CTS 25 2 LPUART 8 CTS Shares trace with SDHC (PIN_25_USDHC1_DATA0). Trace pulled high with 47k resistor. High bus speed not recommended. Cannot be used with SD card is mounted. 6 RTS 24 2 LPUART 8 RTS Shares trace with SDHC (PIN_25_USDHC1_DATA1). Trace pulled high with 47k resistor. High bus speed not recommended. Cannot be used with SD card is mounted. WARNING: LPUART 8 cannot be used if an SD card is mounted in the SD card socket.