DSP56307SLASHD datasheet(27/156 Pages) MOTOROLA

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Signals/Connections

Enhanced Synchronous Serial Interface 0

MOTOROLA

DSP56307 Technical Data

1-21

SC02

PC2

Input/

Output

Input or

Output

Input

Serial Control Signal 2

ÑSC02 is used for frame

sync I/O. SC02 is the frame sync for both the

transmitter and receiver in synchronous mode,

and for the transmitter only in asynchronous

mode. When configured as an output, this

signal is the internally generated frame sync

signal. When configured as an input, this signal

receives an external frame sync signal for the

transmitter (and the receiver in synchronous

operation).

Port C 2

ÑThe default configuration following

reset is GPIO input PC2. When configured as

PC2, signal direction is controlled through

PRR0. The signal can be configured as an ESSI

signal SC02 through PCR0.

Note:

This signal has a weak keeper to maintain the last

state even if all drivers are tri-stated.

SCK0

PC3

Input/

Output

Input or

Output

Input

Serial Clock

ÑSCK0 is a bidirectional

Schmitt-trigger input signal providing the serial

bit rate clock for the ESSI. The SCK0 is a clock

input or output, used by both the transmitter

and receiver in synchronous modes or by the

transmitter in asynchronous modes.

Although an external serial clock can be

independent of and asynchronous to the DSP

system clock, it must exceed the minimum clock

cycle time of 6T (i.e., the system clock frequency

must be at least three times the external ESSI

clock frequency). The ESSI needs at least three

DSP phases inside each half of the serial clock.

Port C 3

ÑThe default configuration following

reset is GPIO input PC3. When configured as

PC3, signal direction is controlled through

PRR0. The signal can be configured as an ESSI

signal SCK0 through PCR0.

Note:

This signal has a weak keeper to maintain the last

state even if all drivers are tri-stated.

Table 1-11

Enhanced Synchronous Serial Interface 0 (Continued)

Signal Name

Type

State During

Reset

Signal Description

Not Recommended for New Design

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