DSP56600FMSLASHAD datasheet(25/76 Pages) NXP

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Pin and Signal Descriptions

DSP56651 Signal Description

Preliminary

MOTOROLA

DSP56651 Technical Data Sheet

1-19

Interrupts

Table 1-12

Interrupt Signals

Signal

Name

Signal

Type

State

during

Reset

Signal Description

INT0–INT3

Input or

Output

Input

Interrupt 0–interrupt 3

—These signals can be programmed as

interrupt inputs or GPIO signals. The signals have on-chip 100 k

Ω

pull-up resistors.

As Schmitt trigger interrupt inputs the signals can be programmed

to be level sensitive, positive edge-triggered, or negative edge-

triggered. When edge-triggered, triggering occurs at a voltage level

and is not directly related to the fall time of the interrupt signal;

however, as signal fall time of the interrupt signal increases, the

probability of generating multiple interrupts due to this noise also

increases.

The signals are GPIOs when not programmed as interrupts. After

reset, the default state for these signals is general purpose input

(GPI).

INT4–INT5

Input or

Output

Input

Interrupt 4–interrupt 5

—These signals can be programmed as

interrupt inputs or GPIO signals, and have 10-27k

Ω pull-up

resistors.

As Schmitt trigger interrupt inputs, the signals can be programmed

to be level sensitive, positive edge-triggered, or negative edge-

triggered. When edge-triggered, triggering occurs at a voltage level

and is not directly related to the fall time of the interrupt signal;

however, as signal fall time of the interrupt signal increases, the

probability of generating multiple interrupts due to this noise also

increases.

The signals are GPIOs when not programmed as interrupts. After

reset, the default state for these signals is GPI.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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