DSP56600FMSLASHAD datasheet(29/76 Pages) NXP

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Pin and Signal Descriptions

DSP56651 Signal Description

Preliminary

MOTOROLA

DSP56651 Technical Data Sheet

1-23

COL6

OC1

Input or

Output

Input

Column strobe 6—

This signal functions as a keypad column strobe

that can be programmed as a regular or open-drain output.

MCU timer 1 output compare

—When programmed as OC1, this is

the MCU Timer 1 output compare signal.

When not programmed as OC1 and not used as a column strobe

signal, this is a GPIO signal. After reset, the default state is GPI

COL7

PWM

Input or

Output

Input

Column strobe 7—

This signal functions as a keypad column strobe

that can be programmed as a regular or open-drain output.

Pulse width modulator output

—When so programmed, this is the

pulse width modulator output.

When not programmed as PWM and not used as a column strobe

signal, this is a GPIO signal. After reset, the default state is GPI

ROW0–

ROW4

Input or

Output

Input

Row sense 0–4—

These signals function as keypad row senses.

When not used as Row Sense signals, these are GPIO signals. After

reset, the default state is GPI. These signals have on-chip 22 k

Ω pull-

up resistors.

ROW5

IC2B

Input or

Output

Input

Row sense 5—

This signal functions as a keypad row sense.

MCU input compare 2 timer

—When so programmed, this signal

can be the input capture for the MCU input compare 2 timer.

When not programmed as IC2B and not used as a row sense signal,

this is a GPIO signal. After reset, the default state is GPI.

Table 1-14

Keypad Port 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

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