Silex technology SX-560 GPIO3 Tspics, GPIO4 DTR0, GPIO5 DSR0, GPIO6 DCD0, GPIO7 GRN, GPIO8 YEL

Figure 5 RS-232 Cable Pinouts

Table 7 RS-232 Cable Pinout Description

Pin	Description
1	DCD (Data Carrier Detect) Input*
6	DSR (Data Set Ready) Input*
2	RxD (Receive Data) Input
3	TxD (Transmit Data) Output
4	DTR (Data Terminal Ready) Output*
7	RTS (Request To Send) Output*
8	CTS (Clear To Send) Input*
5	Ground

*Note: Serial Port 1 (J3) supports all signals. Serial Port 2 (J4) supports RxD, TxD, RTS, and CTS. Serial Port 3 (J5; dedicated console port) supports RxD and TxD only.

Using the GPIO Special Functions

Six of the General Purpose I/Os (GPIOs) can be configured for either user-defined operations or for GPIO for special functions. These special functions are summarized in the following table:

Table 8 GPIO Special Functions

	Special Function (default setting)	Description
GPIO_3	TSPICS	Enable SPI temperature sensor
GPIO_4	DTR0	Serial Port 1	DTR modem signal
GPIO_5	DSR0	Serial Port 1	DSR modem signal
GPIO_6	DCD0	Serial Port 1	DCD modem signal
GPIO_7	GRN	Green status LED (D10)
GPIO_8	YEL	Yellow status LED (D9)

The mode of operation for each of the GPIOs can be set by installing jumpers between headers JP7 and JP8 for GPIO operation, or between headers JP8 and JP9 for special function operation (all of the special functions are enabled by default). For example, in the follow diagram, GPIO_3 is enabled for SPI temperature sensor, while GPIO_4 is enabled as the DTR signal (DTR0) for Serial Port 1. The GPIO_5 through GPIO_8 are used as normal GPIOs in this example.

Installing the Evaluation Daughtercard

Silex

Part Number 140-00192-100

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