DSP56600FMSLASHAD datasheet(32/76 Pages) NXP

32 / 76 page

Preliminary

1-26

DSP56651 Technical Data Sheet

MOTOROLA

Pin and Signal Descriptions

DSP56651 Signal Description

Serial Data Port (UART)

Table 1-15

Serial Data Port (UART) Signals

Signal Name

Signal

Type

State

during

Reset

Signal Description

Normal:

MUX_CTL driven low

TxD

Input or

Output

Input

UART transmit—

This signal transmits data from the UART.

The signal is a GPIO when not programmed as the TxD signal. After

reset, the default state for this signal is GPI.

Alternate:

MUX_CTL driven high

TDO

Output

Test data output

—When selected, this signal provides the TDO

serial output for test instructions and data from the JTAG TAP

controller. TDO is a tri-state signal that is actively driven in the

shift-IR and shift-DR controller states.

Note:

When this signal is enabled, the primary TDO signal is

disconnected from the TAP controller. (See Table 1-22

on page 1-36.)

Normal:

MUX_CTL driven low

RxD

IC1

Input or

Output

Input

UART receive—

This signal receives data into the UART.

Input compare 1

—When so programmed, the signal connects to an

input capture/output compare timer used for autobaud mode

support.

The signal is a GPIO when not programmed as one of the above

functions. This signal has an on-chip 47 k

Ω pull-up resistor. After

reset, the default state for this signal is GPI.

Alternate:

MUX_CTL driven high

TDI

Input

Test data in

—When selected, this signal provides the TDI serial

input for test instructions and data for the JTAG TAP controller. TDI

is sampled on the rising edge of TCK.

Note:

When this signal is enabled, the primary TDI signal is

disconnected from the TAP controller. (See Table 1-22

on page 1-36.)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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