TDA1307 datasheet(9/36 Pages) PHILIPS

部件名	TDA1307

功能描述	High-performance bitstream digital filter

Download	36 Pages

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制造商	PHILIPS [NXP Semiconductors]

网页	http://www.nxp.com

标志

9 / 36 page

1996 Jan 08

9

Philips Semiconductors

Preliminary speciﬁcation

High-performance bitstream digital ﬁlter

TDA1307

Microprocessor interface

The microprocessor interface provides access to virtually

all of the functional blocks in the audio data processing

section. Its destination is two-fold: system constants (such

as input format and sample frequency) as well as system

variables (attenuation, muting, de-emphasis, volume

control data etc.) can be ‘written to’ the respective blocks

(command mode), and continuously collected stereo peak

data ‘read from’ the peak detection block (peak request).

The system settings are stored in the TDA1307 in an

internal register file. Peak data is read from the stereo

peak value register.

THREE-LINE MICROPROCESSOR INTERFACE BUS

Communication is realized by a three-line bus, consisting

of the following signals (see Fig.6):

• Clock input CL (pin 39), to be generated by the

microprocessor

• Command/request input RAB (pin 42), by which either

of the two mode commands (RAB = 0) and peak request

(RAB = 1) are invoked

• Bidirectional data line DA (pin 38), which either receives

command data from the microprocessor or outputs peak

data from the peak detection block.

CL and RAB both default HIGH by internal pull-up, DATA

is 3-state (high impedance, pull-up, pull-down).

Fig.6 Three-line microprocessor interface bus.

handbook, full pagewidth

MGB984

COMMAND DATA

PEAK DATA

+

TDA1307

MICROPROCESSOR

CLOCK

RAB

42

DA/ACK

38

CL

39

+

REQUEST/COMMAND

+

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