Datasheet

70
AT8xC51SND1C
4109E–8051–06/03
Table 75. MP3STA1 Register
MP3STA1 (S:AFh) – MP3 Decoder Status Register 1
Reset Value = 0001 0001b
Table 76. MP3ANC Register
MP3ANC (S:ADh Read Only) – MP3 Ancillary Data Register
Reset Value = 0000 0000b
Table 77. MP3VOL Register
MP3VOL (S:9Eh) – MP3 Volume Left Control Register
Reset Value = 0000 0000b
76543210
- - - MPFREQ MPFREQ---
Bit
Number
Bit
Mnemonic Description
7 - 5 -
Reserved
The value read from these bits is always 0. Do not set these bits.
4MPFREQ
MP3 Frame Data Request Flag
Set by hardware when MP3 decoder request data.
Cleared when MP3 decoder no more request data .
3MPBREQ
MP3 Byte Data Request Flag
Set by hardware when MP3 decoder request data.
Cleared when writing to MP3DAT.
2 - 0 -
Reserved
The value read from these bits is always 0. Do not set these bits.
76543210
AND7 AND6 AND5 AND4 AND3 AND2 AND1 AND0
Bit
Number
Bit
Mnemonic Description
7 - 0 AND7:0
Ancillary Data Buffer
MP3 ancillary data Byte buffer.
76543210
- - - VOL4 VOL3 VOL2 VOL1 VOL0
Bit
Number
Bit
Mnemonic Description
7 - 5 -
Reserved
The value read from these bits is always 0. Do not set these bits.
4 - 0 VOL4:0
Volume Left Value
Refer to Table 69 for the left channel volume control description.