DSP56857 datasheet(86/662 Pages) FREESCALE

86 / 662 page

Power, Ground and Peripheral Signals

5685X Digital Signal Controller User Manual, Rev. 4

2-18

Freescale Semiconductor

SCK1

(GPIOD2)

Input / Output

ESSI Serial Clock (SCK1)—This bidirectional pin

provides the serial bit rate clock for the transmit

section of the ESSI. The clock signal can be

continuous or gated and can be used by both the

transmitter and receiver in synchronous mode.

Port D GPIO 2—This is a General Purpose I/O pin

available when the ESSI is not in use.

——

—

SC10

(GPIOD3)

Input / Output

ESSI Serial Control Pin 0 (SC10)—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 transmitter1 output or for serial

I/O flag 0.

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

available when the ESSI is not in use.

——

—

SC11

(GPIOD4)

Input / Output

ESSI Serial Control Pin 1 (SC11)—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 transmitter2 output or for serial I/O flag 1.

Port D GPIO (4)—This is a General Purpose I/O

pin available when the ESSI is not in use.

——

—

SC12

(GPIOD5)

Input / Output

ESSI Serial Control Pin 2 (SC12)—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 mode. When configured as an

output, this pin is the internally generated frame

sync signal. When configured as an input, this pin

receives an external frame sync signal for the

transmitter (and the receiver in synchronous

operation).

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

available when the ESSI is not in use.

——

—

Table 2-12. Enhanced Synchronous Serial Interface 1 (Continued)

Signal Name

Signal Type

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

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