DSP56852PB View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56852PB

16-bit Digital Signal Processor

Motorola => Freescale 

Freescale Semiconductor, Inc.

Table 3. DSP56852 Signal and Package Information for the 81-pin MAPBGA

Pin No.

E3

Signal Name

WR

B4

RXD

GPIOE0

D4

TXD

Type

Output

Input

Input/Output

Output(Z)

Description

Bus Control–Write Enable (WR)— is asserted during

external memory write cycles. When WR is asserted low,

pins D0–D15 become outputs and the DSP puts data on the

bus. When WR is deasserted high, the external data is

latched inside the external device. When WR is asserted, it

qualifies the A0–A15 pins. WR can be connected directly to

the WE pin of a Static RAM.

SCI Receive Data (RXD)—This input receives byte-

oriented serial data and transfers it to the SCI receive shift

register.

Port E GPIO (0)—A general purpose I/O pin.

SCI Transmit Data (TXD)—This signal transmits data from

the SCI transmit data register.

GPIOE1

Input/Output Port E GPIO (1)—A general purpose I/O pin.

B2

GPIOC0 Input/Output Port C GPIO (0)—This pin is a General Purpose I/O (GPIO)

pin when the SSI is not in use.

STXD

Output

SSI Transmit Data (STXD)—This output pin transmits serial

data from the SSI Transmitter Shift Register.

A2

GPIOC1 Input/Output Port C GPIO (1)—This pin is a General Purpose I/O (GPIO)

pin when the SSI is not in use.

SRXD

Input

SSI Receive Data (SRXD)—This input pin receives serial

data and transfers the data to the SSI Receive Shift

Register.

A3

SCLK

Input/Output SPI Serial Clock (SCLK)—In Master mode, this pin serves

as an output, clocking slaved listeners. In Slave mode, this

pin serves as the data clock input.

GPIOC2

Input/Output

Port C GPIO (2)—This pin is a General Purpose I/O (GPIO)

pin that can individually be programmed as input or output

pin.

STCK

Input/Output

SSI Serial Transfer 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.

B3

SS

Input

SPI Slave Select (SS)—In Master mode, this pin is used to

arbitrate multiple masters. In Slave mode, this pin is used to

select the slave.

GPIOC3

Input/Output

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

pin that can individually be programmed as input or output

pin.

STFS

Input/Output

SSI Serial Transfer Frame Sync (STFS) —This

bidirectional pin is used to count the number of words in a

frame while transmitting. A programmable frame rate divider

and a word length divider are used for frame rate sync signal

generation.

10

DSP56852 Technical Data

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