MB86434 Datasheet, PDF (12/38 Pages) Fujitsu Component Limited. – 5V Single Power Supply Audio Interface Unit (AIU)

MB86434
(5) Tone Generator Circuit
• Tone Frequency Control Registers
The tone generator uses a clock signal obtained by subdividing the TCLK clock signal input by 1/1, 1/2 or 1/4
according to the data bit in address 1110.
Table 3 Tone Clock Frequency Register Control
Address 1110
D4
D3
0
0
0
1
1
0
1
1
Tone generator clock signal (fIN)
TCLK input clock signal
TCLK input clock signal subdivided by 1/2
TCLK input clock signal subdivided by 1/4
Prohibited
Frequency settings available through the tone frequency control register are determined by the following formula.
Frequency setting f = fIN/(12*(1+n)), n = 1, 2, 3, ..., 255. (where fIN: tone generator clock signal frequency).
Therefore the available frequency setting range when fIN = 512 kHz is between fmin = 167 Hz and fmax = 21333 Hz.
Frequency settings corresponding to each DTMF rated reference frequency are shown in the following table.
Tone type
Service tone
(single tone)
Low tone
D
T
M
F
High tone
Rated
reference
frequency
(generator
frequency)
262 Hz
384 Hz
400 Hz
2000 Hz
2600 Hz
697 Hz
770 Hz
852 Hz
941 Hz
1209 Hz
1336 Hz
1477 Hz
1633 Hz
Table 4 Tone Frequency Register Control
Frequency
setting
Addres
1010/1100
Data bit
D4 D3 D2 D1 D0
(Condition: 512 kHz)
Address
1011/1101
n
Data bit
D4 D3 D2 D1 D0
Error
261.7 Hz — 1 0 1 0 * 0 0 1 0 162 –0.11%
384.4 Hz — 0 1 1 0 * 1 1 1 0 110
398.7 Hz — 0 1 1 0 * 1 0 1 0 106
0.10%
–0.32%
2031.7 Hz — 0 0 0 1 * 0 1 0 0 20
1.56%
2666.7 Hz — 0 0 0 0 * 1 1 1 1 15
699.4 Hz — 0 0 1 1 * 1 1 0 0 60
2.50%
0.34%
775.7 Hz — 0 0 1 1 * 0 1 1 0 54
0.74%
853.3 Hz — 0 0 1 1 * 0 0 0 1 49
948.1 Hz — 0 0 1 0 * 1 1 0 0 44
0.15%
0.75%
1219.0 Hz — 0 0 1 0 * 0 0 1 0 34
0.82%
1333.3 Hz — 0 0 0 1 * 1 1 1 1 31
1471.3 Hz — 0 0 0 1 * 1 1 0 0 28
–0.20%
–0.38%
1641.0 Hz — 0 0 0 1 * 1 0 0 1 25
0.48%
Note: • Setting values are BIN display values
• Error represents frequency setting error with respect to rated reference frequency.
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