YSS943 YAMAHA [YAMAHA CORPORATION], YSS943 Datasheet - Page 19

• Manufacturer Part Number: YSS943
• Description: ADAMB Advanced Digital Audio Multi channel decode processor
• Manufacturer: YAMAHA [YAMAHA CORPORATION]

YSS944/943/940
Interrupt Requests
This LSI’s status changes by any of the following five factors are externally reported as interrupt requests via
the nINT pin.
IM register can enable or disable generation of the interrupt of each interrupt factor, and IR register can check
generation of and clear an interrupt factor. However, generation of an interrupt factor is not affected by the
IM register setting. Changes in the status of this LSI are always detected and reported to IR register.
General Purpose I/O Ports
The general-purpose I/O ports IOPORT7 to IOPORT0 have the following functions. The functions are
switched by IOSEL[7:0].
A functional outline of IOPORT7 to IOPORT0 is shown below.
<1> When mute status is set by the auto mute function
<2> When mute status is canceled by the auto mute function
<3> When decode information is changed
<4> When the main decoder is changed (MAINMOD[7:0] are changed)
<5> When the post decoder is changed (POSTMOD[7:0] are changed)
<1> Input port:
<2> Output port:
<3> CA comparison port:
Pin statuses are read via IPORT[7:0].
Setting values in OPORT[7:0] are output from pins.
IOPORT3 to IOPORT0 function as a CA comparison port that is used when nMICS is shared by
several LSIs.
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