DSP56857 datasheet(85/662 Pages) FREESCALE

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Power, Ground and Peripheral Signals

Overview, Rev. 4

Freescale Semiconductor

2-17

SC00

(GPIOC3)

Input / Output

ESSI Serial Control Pin 0—The function of this

pin is determined by the selection of either

synchronous or asynchronous mode. For

asynchronous mode, this pin will be used for the

receive clock I/O. For synchronous mode, this pin

is used either for transmitter 1 output or for serial

I/O flag 0.

Port C GPIO 3—This is a General Purpose I/O pin

when the ESSI is not in use.

SC01

(GPIOC4)

Input / Output

ESSI Serial Control Pin 1—The function of this

pin is determined by the selection of either

synchronous or asynchronous mode. for

asynchronous mode, this pin is the receiver frame

sync I/O. For synchronous mode, this pin is used

either for transmitter 2 output or for serial I/O flag

Port C GPIO 4—This is a General Purpose I/O pin

when the ESSI is not in use.

SC02

(GPIOC5)

Input / Output

ESSI Serial Control Pin 2—This pin 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 more.

When configured as an output, this pin is the

internally generated frame sync signal. When

configured as an input, this pin receives an

external sync signal for the transmitter, and the

receiver in the synchronous operation.

Port C GPIO 5—This is a General Purpose I/O pin

capable of being independently programmed as an

input or output pin.

Table 2-12. Enhanced Synchronous Serial Interface 1

Signal Name

Signal Type

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

STD1

(GPIOD0)

Output(Z)

Input / Output

ESSI Transmit Data (STD1)—This output pin

transmits serial data from the ESSI Transmitter

Shift Register.

Port D GPIO 0—This is a General Purpose I/O pin

available when the ESSI is not in use.

——

—

SRD1

(GPIOD1)

Input

Input / Output

ESSI Receive Data (SRD1)—This input pin

receives serial data and transfers the data to the

ESSI Receive Shift Register.

Port D GPIO 1—This is a General Purpose I/O pin

available when the ESSI is not in use.

——

—

Table 2-11. Enhanced Synchronous Serial Interface 0 (Continued)

Signal Name

Signal Type

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

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