General-Purpose Input/Output (Gpio) - Texas Instruments TMS320C6712D User Manual

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
GPxDIR = 0
GPxDIR = 1
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 default configuration.
31
15 14 13 12
Reserved
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
15 14 13 12
Reserved
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).
FLOATING POINT DIGITAL SIGNAL PROCESSOR
GP[x] pin is enabled
GP[x] pin is an input
GP[x] pin is an output
24 23
Reserved
R-0
11 10 9 8
24 23
Reserved
R-0
11 10 9 8
R/W-0 R/W-0 R/W-0 R/W-0
•
POST OFFICE BOX 1443
SPRS293A − OCTOBER 2005 − REVISED NOVEMBER 2005
7 6 5 4
GP7 GP6 GP5 GP4
EN EN EN EN
R/W-1 R/W-1 R/W-1 R/W-1
7 6 5 4
GP7 GP6 GP5 GP4
DIR DIR DIR DIR
R/W-0 R/W-0 R/W-0 R/W-0
HOUSTON, TEXAS 77251−1443
TMS320C6712D
16
3 2 1 0
GP2
— EN — —
R/W-0 R/W-0 R/W-0 R/W-0
16
3 2 1 0
GP2
— DIR — —
R/W-0 R/W-0 R/W-0 R/W-0
53