DSP56600FMSLASHAD datasheet(34/76 Pages) NXP

34 / 76 page

Preliminary

1-28

DSP56652 Technical Data Sheet

MOTOROLA

Pin and Signal Descriptions

DSP56652 Signal Description

For serial data port (UART) signals equipped with resistors, all pull-ups and

pull-downs are automatically disconnected when the pin is an output.

Normal:

MUX_CTL driven low

CTS

Input or

Output

Input

Clear to sendÑ

This signal functions as the UART CTS signal, and is

equipped with a 47k

W pull-up.

Note:

The signal is a GPIO when not used as CTS.

After reset, the default state for this signal is GPI.

Alternate:

MUX_CTL driven high

MCU_DE

Input

Output

Input

Microcontroller 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 acknowledges

that the MCU has entered the debug mode. The signal is equipped

with an open-drain 47k

W pull-up resistor.

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

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

an output signal for several clock cycles.

Note:

When this signal is enabled, the primary MCU_DE signal is

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

Note:

There are four additional signals that support UART operation, provided as follows:

DSRÑdata set ready. This is an alternate function for the INT6 signal. (See Table 1-12

on page 1-19.)

DTRÑdata terminal ready. This is an alternate function for the INT7 signal. (See Table 1-12

on page 1-19.)

DCDÑdata carrier detect. This is an alternate function for the ROW6 signal. (See Table 1-14

on page 1-22.)

RIÑring indicator. This is an alternate function for the ROW7 signal. (See Table 1-14

on page 1-22.)

Table 1-15

Serial Data Port (UART) 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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