MAS3587F Micronas, MAS3587F Datasheet - Page 30

• Manufacturer Part Number: MAS3587F
• Description: MPEG Layer 3 Audio Encoder/Decoder
• Manufacturer: Micronas

MAS 3587F
3.3.1.12. Clear SYNC Signal (Code 5
After the successful decoding of an MPEG frame the signal at pin SYNC rises and thus generates an interrupt event
for the microcontroller. Issuing this command lets the signal at pin SYNC return to ’0’.
3.3.1.13. Default Read
The Default Read command is the fastest way to get information from the MAS 3587F. Executing the Default Read
in a polling loop can be used to detect a special state during decoding.
The Default Read command immediately returns the lower 16 bit content of a specific RAM location as defined by
the pointer D0:ffb. The pointer must be loaded before the first Default Read action occurs. If the MSB of the pointer
is set, the pointer refers to a memory location in D1 rather than to one in D0.
Example: For watching D1:123 the pointer D0:ffb must be loaded with 8123
<DW 68 e0 00
Now Default Read commands can be issued as often as desired:
<DW 69 <DR
<DW 69 <DR
30
S
S
00 01
0f fb
00 08
01 23>
DW
DW
W
W
dd
dd
A
A
dd>
dd>
$68
$69
W
W
write to D0 memory
1 word to write
start address ffb
value = 8...
...0123
'HIDXOW 5HDG command
16 bit content of the
address as defined by the
pointer
... and do it again
A
A
S
hex
5,0
hex
)
d3,d2
DR
A
W
A
0,0
A
d1,d0
W
W
A
N
P
P
hex
:
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Micronas