Datasheet

64
AT89C5132
4173C–USB–07/04
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
Reset Value = 1011 0010b
76543210
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 60 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 (I
2
S 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.
76543210
– – MSREQ MUDRN - DUP1 DUP0 AUDEN
Bit
Number
Bit
Mnemonic Description
7 - 6 –
Reserved
The values read from these bits is always 0. Do not set this bit.
5MSREQ
Audio Sample Request Flag Mask Bit
Set to prevent the SREQ flag from generating an audio interrupt.
Clear to allow the SREQ flag to generate an audio interrupt.
4 MUDRN
Audio Sample Under-run Flag Mask Bit
Set to prevent the UDRN flag from generating an audio interrupt.
Clear to allow the UDRN flag to generate an audio interrupt.
3–
Reserved
The values read from this bit is always 0. Do not set this bit.
2 - 1 DUP1:0
Audio Duplication Factor
Refer to Table 50 for Bits description.
0 AUDEN
Audio Interface Enable Bit
Set to enable the audio interface.
Clear to disable the audio interface.