
Audio Signaling Processor
9
MX803A PRELIMINARY INFORMATION
1996 MX
COM, INC.
Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
Doc. # 20480122.003
5.2 Address/Commands
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 1 shows the list of A/C bytes relevant to the MX803A.
Command Assignment
Address/Command (A/C) Byte
Hex
Data Bytes
Binary
msb lsb
00000001
00110000
00110001
00110010
00110011
00110100
00110101
00110110
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
+ 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
Table 1: C-BUS Address/Commands
0
1000
208Hz to 3000Hz
625Hz to 3000Hz
313Hz to 1500Hz
1250Hz to 6000Hz
2000
3000
4000
5000
6000
0
1000
2000
3000
4000
5000
6000
Frequency (Hz)
(TX) Tone Generators 1 and 2
(RX) Mid Band
(RX) High Band
(RX) Extended Band
Figure 4: MX803A Frequencies