Audio Signaling Processor
17
MX803A PRELIMINARY INFORMATION
1996 MX
COM, INC.
Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
Doc. # 20480122.003
SIGNAL INPUT
NOTONE TIMER
Timing Period "Primed"
S
INPUT
S
INPUT
S
INPUT
NOTONE TIMER
NOTONE TIMER
Valid Tone
"RX Measure
Complete" Set
"RX Measure
Complete" Set
"RX Measure
Complete" Set
"RX Measure
Complete" Set
"RX Measure
Complete" Set
"RX Measure
Complete" Set
"RX Measure
Complete" Set
Timing Period "Primed"
Timing Period "Not Reset"
Timing Period "Reset"
Timing Period "Primed"
Signal Fades
"RX Notone Timer Expired" and Not Set
"RX Notone Timer Expired" and Set
Signal Lost and Recovered
Figure 7: Notone Timing
5.2.7 Write to General Purpose Timer Register
A/C 36
H
, 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
μ
C. 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.