Audio Signaling Processor
Page 12 of 26
MX803A PRELIMINARY INFORMATION
5.2.3 TX Tone Generator Registers 1 and 2
Each TX Tone Generator is controlled individually by writing a two-byte command to the relevant TX Tone
Generator Register. The format of this command word, which is different for each tone generator, is shown
below with the calculations required for tone frequency (fTONE) generation described in the following text.
5.2.3.1 Write to TX Tone Generator 1 Register
A/C 34H, followed by 2 bytes of Command Data
MSB
Bit Numbers
LSB
(loaded first)
(loaded last)
15
0
14
0
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Notone/Enable These 13 bits (0 to 12) are used to produce a binary number,
designated ‘A’. ‘A’ is used in the formulas below to set the TX Tone 1
frequency (fTONE1).
Table 6: Tx Tone Generator 1
5.2.3.1.1 SETTING TX TONE GENERATOR 1
The binary number produced by Bits 0 to 12 (MSB) is designated “A.” If “A” = all logic “0” TX Tone Generator
1 is Powersaved.
Bit 13 at logic
1
0
=
=
Tone 1 Output at VBIAS (NOTONE)
Tone 1 Output Enabled
Bits14 and15(MSB) must be logic 0
5.2.3.2 Write to TX Tone Generator 2 Register
A/C 35H, followed by 2 bytes of Command Data
MSB
(loaded first)
Bit Numbers
LSB
(loaded last
15
0
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CAL/CUES
Notone/Enable These 13 bits (0 to 12) are used to produce a binary number,
designated ‘B’. ‘B’ is used in the formulas below to set the TX Tone 2
frequency (fTONE2).
Table 7: Tx Tone Generator 2
Write to TX Tone Generator 2 Register Notes:
Programming Tone Generator 2 to Notone will place the CAL/CUES output at VBIAS via a 40kΩ internal
resistor.
Programming Tone Generator 2 to Powersave will place the CAL/CUES output at VSS.
If both Tone Generators are Powersaved, the Input Amplifier is also Powersaved
5.2.3.2.1 SETTING TX TONE GENERATOR 2
The binary number produced by bits 0 to 12 (MSB) is designated “B.” If “B” = all logic “0” then TX Tone
Generator 2 is Powersaved.
Bit 13 at logic 1
=
=
=
=
Tone 1 Output at VBIAS (NOTONE)
Tone 1 Output Enabled
0
Bit 14 at logic 1
0
Squarewave CAL Output
Sinewave CUES Output
Bit 15 (MSB) must be a logic “0.”
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