MAS3587F datasheet(30/82 Pages) MICRONAS

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MAS 3587F

ADVANCE INFORMATION

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3.3.1.12. Clear SYNC Signal (Code 5hex)

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 8123hex:

<DW 68 e0 00

write to D0 memory

00 01

1 word to write

0f fb

start address ffb

00 08

value = 8...

01 23>

...0123hex

Now Default Read commands can be issued as often as desired:

<DW 69 <DR

'HIDXOW5HDG command

dd dd>

16 bit content of the

address as defined by the

pointer

... and do it again

$68

5,0

0,0

$69

d3,d2

d1,d0

MAS3587F 데이터시트(PDF) 30 Page - Micronas