DSP56156ROM datasheet(12/76 Pages) MOTOROLA

12 / 76 page

DSP56156 Data Sheet

MOTOROLA

Pin Descriptions

acknowledge, HACK enables the HI

Interrupt Vector Register (IVR) onto

the host data bus H0-H7 if the Host Re-

quest HREQ output is asserted. In this

case, all other HI control pins are ig-

nored and the HI state is not affected.

HACK may be programmed as a gen-

eral purpose I/O pin called PB14 when

the HI is not being used.

16-bit Timer

TIN (Timer Input)

— input*. This input re-

ceives external pulses to be counted by

the on-chip 16-bit timer when external

clocking is selected. The pulses are in-

ternally synchronized to the DSP core

internal clock. TIN may be pro-

grammed as a general purpose I/O pin

called PC10 when the external event

function is not being used.

TOUT (Timer Output)

— output*. This out-

put generates pulses or toggles on a

timer overflow event or a compare

event. TOUT may be programmed as a

general purpose I/O pin called PC11

when disabled by the timer out enable

bits (TO2-TO0).

Synchronous Serial

Interfaces (SSI)

STD0-1 (SSI0-1 Transmit Data)

— output*.

These output pins transmit serial data

from the SSI0-1 Transmit Shift Register.

STD0 and STD1 may be programmed

as a general purpose I/O pin called

PC0 and PC5, respectively, when the

STD function is not being used.

SRD0-1 (SSI0-1 Receive Data)

— input*.

These input pins receive serial data and

transfer the data to the SSI0-1 Receive

Shift Register. SRD0 and SRD1 may be

programmed as a general purpose I/O

pin called PC1 and PC6, respectively,

when the SRD function is not being

used.

SCK0-1 (SSI0-1 Serial Clock)

— bidirection-

al.

These bidirectional pins provide the

serial bit rate clock for the SSI0-1 inter-

face. SCK0 and SCK1 may be pro-

grammed as a general purpose I/O pin

called PC2 and PC7, respectively,

when the SSI0-1 interfaces are not be-

ing used.

SC10-11 (SSI0-1 Serial Control 1)

— bidirec-

tional.

These bidirectional pins are

used by the SSI0-1 serial interface as

frame sync I/O or flag I/O. SC10 and

SC11 may be programmed as a general

purpose I/O pin called PC3 and PC8,

respectively, when the SSI0-1 are not

using these pins.

SC00-01 (SSI0-1 Serial Control 0)

— bidirec-

tional.

These bidirectional pins are

used by the SSI0-1 serial interface as

frame sync I/O or flag I/O. SC00 and

SC01 may be programmed as a general

purpose I/O pin called PC4 and PC9,

respectively, when the SSI0-1 are not

using these pins.

16-bit Timer

SSI

* These pins can be bidirectional when programmed as general purpose I/O.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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