TMS320F2812 datasheet(85/170 Pages) TI

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Peripheral I/O

MUX

Internal (Pullup or Pulldown)

Digital I/O

XRS

High-Impedance

Enable (1)

High-

Impedance

Control

GPxDIR

GPxMUX

GPxQUAL

GPxDAT/SET/CLEAR/TOGGLE

Input Qualification

SYSCLKOUT

TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

www.ti.com

SPRS174S – APRIL 2001 – REVISED MARCH 2011

Figure 4-12 shows how the various register bits select the various modes of operation for GPIO function.

In the GPIO mode, when the GPIO pin is configured for output operation, reading the GPxDAT data register only

gives the value written, not the value at the pin. In the peripheral mode, the state of the pin can be read through the

GPxDAT register, provided the corresponding direction bit is zero (input mode).

Some selected input signals are qualified by the SYSCLKOUT. The GPxQUAL register specifies the qualification

sampling period. The sampling window is 6 samples wide and the output is only changed when all samples are the

same (all 0's or all 1's). This feature removes unwanted spikes from the input signal.

Figure 4-12. GPIO/Peripheral Pin Multiplexing

NOTE

The input function of the GPIO pin and the input path to the peripheral are always enabled. It

is the output function of the GPIO pin that is multiplexed with the output path of the primary

(peripheral) function. Since the output buffer of a pin connects back to the input buffer, any

GPIO signal present at the pin will be propagated to the peripheral module as well.

Therefore, when a pin is configured for GPIO operation, the corresponding peripheral

functionality (and interrupt-generating capability) must be disabled. Otherwise, interrupts may

be inadvertently triggered. This is especially critical when the PDPINTA and PDPINTB pins

are used as GPIO pins, since a value of zero for GPDDAT.0 or GPDDAT.5 (PDPINTx) will

put PWM pins in a high-impedance state. The CxTRIP and TxCTRIP pins will also put the

corresponding PWM pins in high impedance, if they are driven low (as GPIO pins) and bit

EXTCONx.0 = 1.

Peripherals

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Product Folder Link(s): TMS320F2810 TMS320F2811 TMS320F2812 TMS320C2810 TMS320C2811 TMS320C2812

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