DSP56F826 datasheet(16/60 Pages) FREESCALE

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56F827 Technical Data, Rev. 12

Freescale Semiconductor

STD

(GPIOC3)

Output

Input/Output

SSI Transmit Data (STD)—This output pin transmits serial data from the SSI

Transmitter Shift Register.

Port C GPIO—This is a General Purpose I/O (GPIO) pin with the capability of

being individually programmed as input or output.

After reset, the default state is GPIO input.

STFS

(GPIOC4)

Input

Input/Output

SSI Serial Transmit Frame Sync (STFS)—This bidirectional pin is used by

the Transmit section of the SSI as frame sync I/O or flag I/O. The STFS can be

used by both the transmitter and receiver in synchronous mode. It is used to

synchronize data transfer and can be an input or output pin.

Port C GPIO—This is a General Purpose I/O (GPIO) pin with the capability of

being individually programmed as input or output.

After reset, the default state is GPIO input.

STCK

(GPIOC5)

Input/ Output

Input/Output

SSI Serial Transmit Clock (STCK)—This bidirectional pin provides the serial

bit rate clock for the transmit section of the SSI. The clock signal can be

continuous or gated. It can be used by both the transmitter and receiver in

synchronous mode.

Port C GPIO—This is a General Purpose I/O (GPIO) pin with the capability of

being individually programmed as input or output.

After reset, the default state is GPIO input.

SCLK

(GPIOF4)

102

Input/Output

SPI Serial Clock—In master mode, this pin serves as an output, clocking

slaved listeners. In slave mode, this pin serves as the data clock input.

Port F GPIO—This General Purpose I/O (GPIO) pin can be individually

programmed as input or output.

After reset, the default state is SCLK.

MOSI

(GPIOF5)

101

Input/Output

SPI Master Out/Slave In (MOSI)—This serial data pin is an output from a

master device and an input to a slave device. The master device places data

on the MOSI line a half-cycle before the clock edge that the slave device uses

to latch the data.

Port F GPIO—This General Purpose I/O (GPIO) pin can be individually

programmed as input or output.

MISO

(GPIOF6)

100

Input/Output

SPI Master In/Slave Out (MISO)—This serial data pin is an input to a master

device and an output from a slave device. The MISO line of a slave device is

placed in the high-impedance state if the slave device is not selected.

Port F GPIO—This General Purpose I/O (GPIO) pin can be individually

programmed as input or output.

After reset, the default state is MISO.

Table 2-2 56F827 Signal and Package Information for the 128 Pin LQFP (Continued)

Signal Name

Pin No.

Type

Description

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