YSS944 Datasheet, PDF (8/34 Pages) YAMAHA CORPORATION – ADAMB Advanced Digital Audio Multi channel decode processor

YSS944/943/940
Type
General-purpose
I/O ports
General-purpose
I/O ports
Test
Pin Pin Name I/O
Function
No.
Note 1)
135 nMUTE
O This is the output pin during auto mute periods.
133 ZEROFLG O This is the consecutive zero data input detection pin.
13 STATUS7 O These are status output pins 7 to 0.
12 STATUS6
11 STATUS5
They are used to confirm firmware operations.
Normally, they should be left unconnected.
10 STATUS4
116 STATUS3
115 STATUS2
114 STATUS1
113 STATUS0
57 IOPORT7 I(+)/O These are general I/O port pins 7 to 0.
56 IOPORT6
Their I/O status can be set via register settings.
55 IOPORT5 I(+)/O These are general I/O port pins 7 to 0.
54 IOPORT4
Their I/O status can be set via register settings.
53 IOPORT3
52 IOPORT2
47 IOPORT1
46 IOPORT0
16
TEST
Is Test pins
17
Connect these pins to a ground.
24
25
132
Note 1) I/O symbols
• I: Input
• Is: Schmitt trigger input
• O: Output
• Ot: Tri-state output
• I/O: I/O
• I(+)/O: Pull-up during input, no pull-up during output
Note 2) Example of circuit connected to crystal oscillator
XI
XO
12.288 MHz
* The above resistor and capacitor vary depending on the crystal oscillator. Be sure to comply with the specifications of the
crystal oscillator used.
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