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MX803A

Audio Signaling Processor

MX-COM Inc  

Audio Signaling Processor

17

SIGNAL INPUT SINPUT

MX803A PRELIMINARY INFORMATION

Valid Tone

"RX Measure "RX Measure

Complete" Set Complete" Set

"RX Measure

Complete" Set

NOTONE TIMER

Timing Period "Primed"

SINPUT

Signal Fades

"RX Measure

Complete" Set

NOTONE TIMER

Timing Period "Primed"

Timing Period "Not Reset"

"RX Notone Timer Expired" and Set

SINPUT

Signal Lost and Recovered

"RX Measure "RX Measure

Complete" Set Complete" Set

"RX Measure

Complete" Set

NOTONE TIMER

Timing Period "Primed"

Timing Period "Reset"

"RX Notone Timer Expired" and Not Set

Figure 7: Notone Timing

5.2.7 Write to General Purpose Timer Register

A/C 36H, followed by 1 byte of Command Data

5.2.7.1 Operation of the General Purpose Timer

This timer, which is not dedicated to any specific function within the MX803A, can be used within the DBS 800 system to

indicate time-elapsed periods of between 10-150ms in the High Band or 20-300ms in the Mid Band to the µC. Setting of

the timer is by loading a single byte data word via the C-BUS (See Table 7) to the MX803A through the Command Data

line.

The timer will be reset and the run-down started on completion of Timer Data Word loading.

When the programmed time period has expired, the General Purpose Timer Expired bit (bit 2) in the Status Register and

the Interrupt are set.

The General Purpose Timer Expired bit is cleared:

1. By a read of the Status Register

2. New G/P Timer information

3. General Reset Command.

© 1996 MX•COM, INC.

Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054

Doc. # 20480122.003

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