DSP56600FMSLASHAD datasheet(28/76 Pages) NXP

28 / 76 page

Preliminary

1-22

DSP56651 Technical Data Sheet

MOTOROLA

Pin and Signal Descriptions

DSP56651 Signal Description

For Interrupt signals equipped with resistors, all pull-ups and pull-downs are

automatically disconnected when the pin is an output.

Timers

Keypad Port

DSP_IRQ

Input

DSP external interrupt request

—This active low Schmitt trigger

input can be programmed as a level-sensitive or negative edge-

triggered maskable interrupt request input during normal

instruction processing. If the DSP is in the stop state and DSP_IRQ is

asserted, the DSP exits the stop state.

This signal has an on-chip 47 k

Ω pull-up resistor.

Table 1-13

Timer Signals

Signal Name

Signal

Type

State

during

Reset

Signal Description

TOUT0–

TOUT7

Input or

Output

Input

Timer output 0–7—

These are timer output signals.

After reset, the default state for these signals is GPI.

Note:

These signals are GPIOs when not used as timer outputs.

Table 1-14

Keypad Port Signals

Signal Name

Signal

Type

State

during

Reset

Signal Description

COL0–COL5

Input or

Output

Input

Column strobe 0–5—

These signals function as keypad column

strobes that can be programmed as regular or open-drain outputs.

When not used as column strobe signals, these are GPIO signals.

After reset, the default state is GPI.

Table 1-12

Interrupt Signals (Continued)

Signal

Name

Signal

Type

State

during

Reset

Signal Description

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

DSP56600FM/AD Datasheet(PDF) 28 Page - NXP Semiconductors

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