Rainbow Electronics AT89C51SND1C - Manual (Page 70)

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
7 6 5 4 3 2 1 0
- - - MPFREQ MPFREQ - - -
Bit
Number
Bit
Mnemonic Description
7 - 5 -
Reserved
The value read from these bits is always 0. Do not set these bits.
4 MPFREQ
MP3 Frame Data Request Flag
Set by hardware when MP3 decoder request data.
Cleared when MP3 decoder no more request data .
3 MPBREQ
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.
7 6 5 4 3 2 1 0
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.
7 6 5 4 3 2 1 0
- - - 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.