DSP56600FMSLASHAD datasheet(30/76 Pages) NXP

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Preliminary

1-24

DSP56652 Technical Data Sheet

MOTOROLA

Pin and Signal Descriptions

DSP56652 Signal Description

Normal:

MUX_CTL driven low

ROW6

SC2A

DCD

Input or

Output

Input or

Output

Input

Row sense 6Ñ

This signal functions as a keypad row sense and is

equipped with an on-chip 100k

W pull-up resistor.

Audio codec serial control 2

(alternate)ÑWhen programmed as

SC2A, this signal provides I/O frame synchronization for the serial

audio codec port. In synchronous mode, the signal provides the

frame sync for both the transmitter and receiver. In asynchronous

mode, the signal provides the frame sync for the transmitter only.

As SC2A, this pin has a 100k

W pull-down resistor.

Note:

When this signal is used as SC2A, the primary SC2A signal

is disabled. (See Table 1-18 on page 1-31.)

Data carrier detect

ÑWhen programmed as GPIO output, this

signal can be used as the DSR output for the serial data port. (See

Table 1-15

on page 1-26.) After reset, the default state is GPI.

Alternate:

MUX_CTL driven high

DSP_DE

Input

Output

Input

Digital signal processor debug event

ÑAs an input signal, this

signal provides a means to enter the debug mode of operation from

an external command converter. An an output signal, it acknow-

ledges that the DSP has entered the debug mode. When program-

med as DSP_DE, this signal has an open-drain 100k

W pull-up.

When the DSP enters the debug mode due to a debug request or as

the result of meeting a breakpoint condition, it asserts DSP_DE as

an output signal for three clock cycles.

Note:

When this signal is enabled, the primary DSP_DE signal is

disabled. (See Table 1-21 on page 1-35.)

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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