TMS320C6745DPTP3 datasheet(82/227 Pages) TI

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GP [ ]asinput

n m

GP [ ]asinput

n m

GP [ ]asoutput

n m

TMS320C6745, TMS320C6747

SPRS377E – SEPTEMBER 2008 – REVISED FEBRUARY 2013

www.ti.com

5.9.2

GPIO Peripheral Input/Output Electrical Data/Timing

Table 5-10. Timing Requirements for GPIO Inputs(1) (see Figure 5-10)

No.

PARAMETER

MIN

MAX

UNIT

tw(GPIH)

Pulse duration, GPn[m] as input high

2C(1) (2)

tw(GPIL)

Pulse duration, GPn[m] as input low

2C(1) (2)

(1)

The pulse width given is sufficient to generate a CPU interrupt or an EDMA event. However, if a user wants to have C6745/6747

recognize the GPIx changes through software polling of the GPIO register, the GPIx duration must be extended to allow C6745/6747

enough time to access the GPIO register through the internal bus.

(2)

C=SYSCLK4 period in ns.

Table 5-11. Switching Characteristics Over Recommended Operating Conditions for GPIO Outputs

(see Figure 5-10)

No.

PARAMETER

MIN

MAX

UNIT

tw(GPOH)

Pulse duration, GPn[m] as output high

2C(1) (2)

tw(GPOL)

Pulse duration, GPn[m] as output low

2C(1) (2)

(1)

This parameter value should not be used as a maximum performance specification. Actual performance of back-to-back accesses of the

GPIO is dependent upon internal bus activity.

(2)

C=SYSCLK4 period in ns.

Figure 5-10. GPIO Port Timing

5.9.3

GPIO Peripheral External Interrupts Electrical Data/Timing

Table 5-12. Timing Requirements for External Interrupts(1) (see Figure 5-11)

No.

PARAMETER

MIN

MAX

UNIT

tw(ILOW)

Width of the external interrupt pulse low

2C(1) (2)

tw(IHIGH)

Width of the external interrupt pulse high

2C (1) (2)

(1)

The pulse width given is sufficient to generate an interrupt or an EDMA event. However, if a user wants to have C6745/6747 recognize

the GPIO changes through software polling of the GPIO register, the GPIO duration must be extended to allow C6745/6747 enough time

to access the GPIO register through the internal bus.

(2)

C=SYSCLK4 period in ns.

Figure 5-11. GPIO External Interrupt Timing

Peripheral Information and Electrical Specifications

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TMS320C6745DPTP3 Datasheet(PDF) 82 Page - Texas Instruments

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