DSP56600FMSLASHAD datasheet(24/76 Pages) NXP

24 / 76 page

Preliminary

1-18

DSP56652 Technical Data Sheet

MOTOROLA

Pin and Signal Descriptions

DSP56652 Signal Description

For Reset, mode, and MUX control signals equipped with resistors, all pull-ups and

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

MUX_CTL

Input

Multiplexer control

ÑThis input allows the designer to select an

alternate set of pins to be used for RESET_IN, the debug control

port signals, and the JTAG signals as defined below:

If MUX_CTL is driven low, the normal functions are selected. If

MUX_CTL is driven high, the alternate functions are selection.

Note:

The user is responsible to ensure that transition between

normal and alternate functions are made smoothly. No

provisions are made in the on-chip hardware to assure

such a smooth switch. The external command converter

uses to drive this signal must ensure that critical pins

(such as the JTAG TMS and TRST signals and RESET_IN)

are driven with inactive values during and after the

switch.

The MUX_CTL signal has an internal 100 k

W pull-down resistor.

STO

Output

Chip

driven

Soft turn off

ÑThis is a general purpose output pin. Its logic state

is not affected by reset.

Table 1-11

Reset, Mode, and Multiplexer Control Signals (Continued)

Signal Name

Signal

Type

State

during

Reset

Signal Description

Normal

(MUX_CTL low)

Alternate

(MUX_CTL high)

Interrupt signals

(See Table 1-12)

INT6/STDA/DSR

TRST

INT7/SRDA/DTR/SCLK

TMS

Keypad signals

(See Table 1-14

on page 1-22)

ROW6/SC2A/DCD

DSP_DE

ROW7/SCKA/RI

TCK

Serial Data Port

(UART) signals

(See Table 1-15

on page 1-26)

TxD

TDO

RxD/IC1

TDI

RTS/IC2A

RESET_IN

CTS

MCU_DE

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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