DSP56600FMSLASHAD datasheet(29/76 Pages) NXP

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DSP56652

DSP56652 Signal Description

Preliminary

MOTOROLA

DSP56652 Technical Data Sheet

1-23

COL6

OC1

Input or

Output

Input

Column strobe 6Ñ

This signal functions as a keypad column strobe

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

MCU timer 1 output compare

ÑWhen 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 7Ñ

This signal functions as a keypad column strobe

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

Pulse width modulator output

ÑWhen 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.

ROW0Ð

ROW4

Input or

Output

Input

Row sense 0Ð4Ñ

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

W pull-

up resistors.

ROW5

IC2B

Input or

Output

Input

Row sense 5Ñ

This signal functions as a keypad row sense.

MCU input compare 2 timer

ÑWhen 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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