Motorola TMS320C6711D warranty General-purpose input/output Gpio, GP7 GP6 GP5 GP4 GP2, Dir

SPRS292A − OCTOBER 2005 − REVISED NOVEMBER 2005

general-purpose input/output (GPIO)

To use the GP[7:4, 2] software-configurable GPIO pins, the GPxEN bits in the GP Enable (GPEN) Register and the GPxDIR bits in the GP Direction (GPDIR) Register must be properly configured.

GPxEN =	1	GP[x] pin is enabled
GPxDIR =	0	GP[x] pin is an input
GPxDIR =	1	GP[x] pin is an output

where “x” represents one of the 7 through 4, or 2 GPIO pins

Figure 9 shows the GPIO enable bits in the GPEN register for the device. To use any of the GPx pins as general-purpose input/output functions, the corresponding GPxEN bit must be set to “1” (enabled). Default values are device-specific, so refer to Figure 9 for the C6711D default configuration.

31							24	23							16
							Reserved
							R-0
15	14	13	12	11	10	9	8		6	5	4	3	2	1	0
								7
								GP7	GP6	GP5	GP4		GP2
			Reserved					EN	EN	EN	EN	—	EN	—	—
			R/W-0					R/W-1	R/W-1	R/W-1	R/W-1	R/W-0	R/W-0	R/W-0	R/W-0

Legend: R/W = Readable/Writeable; -n= value after reset, -x = undefined value after reset

Figure 9. GPIO Enable Register (GPEN) [Hex Address: 01B0 0000]

Figure 10 shows the GPIO direction bits in the GPDIR register. This register determines if a given GPIO pin is an input or an output providing the corresponding GPxEN bit is enabled (set to “1”) in the GPEN register. By default, all the GPIO pins are configured as input pins.

31							24	23							16
							Reserved
							R-0
15	14	13	12		10	9	8		6	5	4	3	2	1	0
				11				7
								GP7	GP6	GP5	GP4		GP2
			Reserved					DIR	DIR	DIR	DIR	—	DIR	—	—
R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0	R/W-0

Legend: R/W = Readable/Writeable; -n= value after reset, -x = undefined value after reset

Figure 10. GPIO Direction Register (GPDIR) [Hex Address: 01B0 0004]

For more detailed information on general-purpose inputs/outputs (GPIOs), see the TMS320C6000 DSP General-Purpose Input/Output (GPIO) Reference Guide (literature number SPRU584).

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 53