DSP56857 datasheet(84/662 Pages) FREESCALE

84 / 662 page

Power, Ground and Peripheral Signals

5685X Digital Signal Controller User Manual, Rev. 4

2-16

Freescale Semiconductor

Table 2-10. Serial Communication Interface 1

Signal Name

Signal Type

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

RXD1

(GPIOE2)

Input

Input / Output

Serial Receive Data 1—This input receives

byte-oriented serial data and transfers it to the

SCI1 receive shift receiver.

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

capable of being independently programmed as an

input or output pin.

TXD1

(GPIOE3)

Output(Z)

Input / Output

Serial Transmit Data 1—This signal transmits

data from the SCI1 transmit data register.

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

capable of being independently programmed as an

input or output pin.

Table 2-11. Enhanced Synchronous Serial Interface 0

Signal Name

Signal Type

Signal Description

853

Pins

854

Pins

855

Pins

857

Pins

858

Pins

STD0

(GPIOC0)

Output(Z)

Input / Output

ESSI Transmit Data 0—This output pin transmits

serial data from the ESSI Transmitter Shift

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

when the ESSI is not in use.

SRD0

(GPIOC1)

Input

Input / Output

ESSI Receive Data 0—This input pin receives

serial data and transfers the data to the ESSI

Transmitter Shift Register.

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

when the ESSI is not is use.

SCK0

(GPIOC2)

Input / Output

ESSI Serial Clock 0—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 C GPIO 2—This is a General Purpose I/O pin

when the ESSI is not is use.

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