AT89C5132-ROTUL datasheet(64/181 Pages) ATMEL

64 / 181 page

4173D–USB–02/06

AT89C5132

Figure 14-6. Voice or Sound Mode Audio Flows

Note:

1. An under-run occurrence signifies that the C51 core did not respond to the previous sample request interrupt. It may never

occur for a correct voice/sound generation. It is the user’s responsibility to mask it or not.

14.7

Registers

Table 51. AUDCON0 Register

AUDCON0 (S:9Ah) – Audio Interface Control Register 0

Reset Value = 0000 1000b

Table 52. AUDCON1 Register

AUDCON1 (S:9Bh) – Audio Interface Control Register 1

Load 8 Samples in the

Audio Buffer

Voice/Song Mode

Configuration

Configure Interface

HLR = X

DSIZ = X

POL = X

JUST4:0 = XXXXXb

DUP1:0 = XX

Program Audio Clock

Enable DAC System

Clock

AUDEN = 1

Wait for DAC

Enable Time

Enable Interrupt

Set MSREQ & MUDRN1

EAUD = 1

Audio Interrupt

Service Routine

Under-run Condition

Load 4 Samples in the

Audio Buffer

Sample Request?

SREQ = 1?

765

4321

JUST4

JUST3

JUST2

JUST1

JUST0

POL

DSIZ

HLR

Bit Number

Bit

Mnemonic

Description

7-3

JUST4:0

Audio Stream Justification Bits

Refer to Section "Data Converter", page 61 for bits description.

2POL

DSEL Signal Output Polarity

Set to output the left channel on high level of DSEL output (PCM mode).

Clear to output the left channel on the low level of DSEL output (I2S mode).

1DSIZ

Audio Data Size

Set to select 32-bit data output format.

Clear to select 16-bit data output format.

0HLR

High/Low Rate Bit

Set by software when the PLL clock frequency is 384·Fs.

Clear by software when the PLL clock frequency is 256·Fs.

765

4321

–

MSREQ

MUDRN

DUP1

DUP0

AUDEN

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