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Digital Audio Interface (DAX)

DSP56362 Technical Data, Rev. 4

Freescale Semiconductor

2-19

2.10

Digital Audio Interface (DAX)

2.11

Timer

Table 2-12 Digital Audio Interface (DAX) Signals

Signal

Name

Type

State During Reset

Signal Description

ACI

PD0

Input

Input, Output, or

Disconnected

Audio Clock Input—This is the DAX clock input. When programmed

to use an external clock, this input supplies the DAX clock. The

external clock frequency must be 256, 384, or 512 times the audio

sampling frequency (256

× Fs, 384 × Fs or 512 × Fs, respectively).

Port D 0—When the DAX is configured as GPIO, this signal is

individually programmable as input, output, or internally disconnected.

The default state after reset is GPIO disconnected.

This input is 5 V tolerant.

ADO

PD1

Output

Input, Output, or

Disconnected

Digital Audio Data Output—This signal is an audio and non-audio

output in the form of AES/EBU, CP340 and IEC958 data in a biphase

mark format.

Port D 1—When the DAX is configured as GPIO, this signal is

individually programmable as input, output, or internally disconnected.

The default state after reset is GPIO disconnected.

This input is 5 V tolerant.

Table 2-13 Timer Signal

Signal

Name

Type

State During Reset

Signal Description

TIO0

Input or Output

Input

Timer 0 Schmitt-Trigger Input/Output—When timer 0 functions as

an external event counter or in measurement mode, TIO0 is used as

input. When timer 0 functions in watchdog, timer, or pulse modulation

mode, TIO0 is used as output.

The default mode after reset is GPIO input. This can be changed to

output or configured as a timer input/output through the timer 0

control/status register (TCSR0). If TIO0 is not being used, it is

recommended to either define it as GPIO output immediately at the

beginning of operation or leave it defined as GPIO input but connected

it to Vcc through a pull-up resistor in order to ensure a stable logic level

at the input.

This input is 5 V tolerant.

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