SCF5250 datasheet(17/48 Pages) MOTOROLA

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Signal Descriptions

SCF5250 Integrated ColdFire® Microprocessor Data Sheet, Rev. 1.1

Freescale Semiconductor

4.12 Digital Audio Interface Signals

4.13 Subcode Interface

There is a 3-line subcode interface on the SCF5250. This 3-line subcode interface allows the device to

format and transmit subcode in EIAJ format to a CD channel encoder device. The three signals are

described in Table 10.

4.14 Analog to Digital Converter (ADC)

The ADOUT signal on the ADOUT/SCLK4/GPIO58 pin provides the reference voltage in PWM format.

This output requires an external integrator circuit (resistor/capacitor) to convert it to a DC level to be input

to the ADREF pin.

The six AD inputs are each fed to their own comparator. The reference input to each (ADREF) is then

multiplexed as only one AD comparison can be made at any one time.

NOTE

To use the ADINx as General Purpose inputs (rather than there analogue

function) it is necessary to generate a fixed comparator voltage level of

VDD/2. This can be accomplished by a potential divider network connected

to the ADREF pin. However in portable applications where stand-by power

Table 9. Digital Audio Interface Signals

Serial Module Signal

Description

Digital Audio In

The EBUIN1/GPIO36, EBUIN2/SCLK_OUT/GPIO13,

EBUIN3/CMD_SDIO2/GPIO14, and QSPI_CS0/EBUIN4/GPIO15

multiplexed signals can serve as general purpose input or can be driven

by various digital audio (IEC958) input sources. Both functionalities are

always active. Input chosen for IEC958 receiver is programmed within

the audio module. Input value on the 4 pins can always be read from the

appropriate GPIO register.

Digital Audio Out

The EBUOUT1/GPIO37 and QSPI_CS1/EBUOUT2/GPIO16

multiplexed pins can serve as general purpose I/O or as digital audio

(IEC958) output. EBUOUT1 is digital audio out for consumer mode,

EBUOUT2 is digital audio out for professional mode. During reset, the

pin is configured as a digital audio output.

Table 10. Subcode Interface Signal

Signal name

Description

RCK/QSPI_DIN/QSPI_DOUT/GPIO26

Subcode clock input. When pin is used as subcode clock, this pin is

driven by the CD channel encoder.

QSPI_DOUT/SFSY/GPIO27

Subcode sync output

This signal is driven high if a subcode sync needs to be inserted in the

EFM stream.

QSPI_CLK/SUBR/GPIO25

Subcode data output

This signal is a subcode data out pin.

SCF5250 Datasheet(PDF) 17 Page - Motorola, Inc

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