Datasheet

VS1053b Datasheet
10 OPERATION
config1(7:6) Usage
’00’ normal mode, process PS if it is available
’01’ process PS if it is available, but in downsampled mode
’10’ reserved
’11’ disable PS processing
AAC decoder can also increase the internal clock automatically when it detects that a file can
not be decoded correctly with the current clock. The maximum allowed clock is configured with
the SCI_CLOCKF register.
If even the highest allowed clock is too slow to decode an AAC file with SBR and PS compo-
nents, the advanced decoding features are automatically dropped one by one until the file can
be played. First the parametric stereo processing is dropped (the playback becomes mono).
If that is not enough, the spectral band replication is turned into downsampled mode (reduced
bandwidth). As the last resort the spectral band replication is fully disabled. Dropped features
are restored at each song change.
10.11.4 Midi
Parameter Address Usage
config1 0x1e03 Miscellaneous configuration
bits [3:0] Reverb: 0 = auto (ON if clock >= 3.0×)
1 = off, 2 - 15 = room size
bytesLeft 0x1e2a/2b The number of bytes left in this track
The lowest 4 bits of config1 controls the reverb effect.
Version: 1.22, 2014-12-19 64