Audio Signaling Processor
Page 9 of 26
MX803A PRELIMINARY INFORMATION
5. Application
Control of the MX803A Audio Signaling Processor's operation is by communication between the
µ
C and the
MX803A internal registers on the C-BUS using Address/Commands (A/Cs) and appended instructions or data.
See Figure 8. The use and content of these instructions is detailed in the following sections.
For additional application information contact MX
•
COM, Inc.
5.1
MX803A Internal Registers
Control Register
Status Register
RX Tone Frequency Register
RX Notone Timer
TX Tone Generator 1 Register
TX Tone Generator 2 Register
General Purpose Timer Register
5.2
Address/Commands
30
H
31
H
32
H
33
H
34
H
35
H
36
H
Write only, control and configuration of the MX803A.
Read only, reporting of device functions.
Read only, indicates frequency of the last received input.
Write only, setting of the RX Notone period.
Write only, setting the required output frequency from TX Tone
Generator 1.
Write only, setting the required output frequency from TX Tone
Generator 2.
Write only, setting of a general purpose sequential time period.
The first byte of a loaded data sequence is always recognized by the C-BUS as an Address/Command (A/C)
byte. Instruction and data transactions to and from this device consist of an A/C byte followed by further
instruction/data or a status/data reply.
Instructions and data are loaded and transferred via C-BUS in accordance with the timing information given in
Figure 8 and Figure 9. Table 3 shows the list of A/C bytes relevant to the MX803A.
Command Assignment
Address/Command (A/C) Byte Data Bytes
Hex
msb
General Reset
Write to Control Register
Read Status Register
Read RX Tone Frequency
Write to Notone Timer
Write to TX Tone Gen. 1
Write to TX Tone Gen. 2
Write to G/Purpose Timer
01
30
31
32
33
34
35
36
Binary
lsb
+ 1 byte instruction to Control Register
+ 1 byte reply from Status Register
+ 2 bytes reply from RX Tone Register
+ 1 byte instruction to Notone Register
+ 2 bytes instruction to TX Tone Gen. 1
+ 2 bytes instruction to TX Tone Gen. 2
+ 1 byte instruction to G/Purpose Timer
00000001
00110000
00110001
00110010
00110011
00110100
00110101
00110110
Table 3: C-BUS Address/Commands
0
1000
2000
3000
4000
5000
6000
(TX) Tone Generators 1 and 2
1250Hz to 6000Hz
208Hz to 3000Hz
(RX) Extended Band
(RX) High Band
625Hz to 3000Hz
(RX) Mid Band
0
1000
313Hz to 1500Hz
2000
3000
4000
5000
6000
Frequency (Hz)
Figure 4: MX803A Frequencies
©2001 MX•COM, INC.
www.mxcom.com
Tele: 800 638 5577 336 744 5050
Fax: 336 744 5054
Doc. # 20480122.005
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