AM1808AZCED3 datasheet(247/264 Pages) TI

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GP [ ]

asinput

n m

GPn m

[ ]

asoutput

GP [ ]

asinput

n m

AM1808

www.ti.com

SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010

6.32.2

GPIO Peripheral Input/Output Electrical Data/Timing

Table 6-135. Timing Requirements for GPIO Inputs(1) (see Figure 6-84)

1.3V, 1.2V, 1.1V,

1.0V

NO.

UNIT

MIN

MAX

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 the device

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

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

(2)

C=SYSCLK4 period in ns.

Table 6-136. Switching Characteristics Over Recommended Operating Conditions for GPIO Outputs

(see Figure 6-84)

1.3V, 1.2V, 1.1V,

1.0V

NO.

PARAMETER

UNIT

MIN

MAX

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 6-84. GPIO Port Timing

6.32.3

GPIO Peripheral External Interrupts Electrical Data/Timing

Table 6-137. Timing Requirements for External Interrupts(1) (see Figure 6-85)

1.3V, 1.2V, 1.1V,

1.0V

NO.

PARAMETER

UNIT

MIN

MAX

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 the device recognize the

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

access the GPIO register through the internal bus.

(2)

C=SYSCLK4 period in ns.

Figure 6-85. GPIO External Interrupt Timing

Peripheral Information and Electrical Specifications

247

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