FEDL7033-02
ML7033
1
Semiconductor
When the CH1RING (CR11-B3) bit is set (“1”), the CH1TG1_8 (CR9-B0) bit and the
CH1TG1_7 to CH1TG1_6 (CR10-B7 to B6) bits are ignored and the CH1TG1_5 to
CH1TG1_0 (CR10-B5 to B0) bits are used to define the ringing tone frequency.
When the CH1RING (CR11-B3) bit is set, the frequency can be set to a value between 15
Hz and 50 Hz at 1 Hz intervals. The value programmed into this field is calculated based on
the desired frequency using the following equation. A partial list of frequencies is shown in
Table 14.
Binary data for CR10-B5 to B0
= (Output Frequency [Hz])
The following is an example of how to program this field when the intended frequency is
20Hz;
Ex) Output Frequency [Hz] = 20d = 010100b
Bits to set in CR10-B5 to B0 = (0,1,0,1,0,0)
Note that the operations are not guaranteed when these bits define a frequency out of a band
between 15 and 50Hz.
Table 14 Tone Generator Frequency Setting (CH1RING bit = “1”)
CR9
B0
—
—
—
—
—
—
:
CR10
B4
Frequency
(Hz)
decimal
hex
B7
—
—
—
—
—
—
:
B6
—
—
—
—
—
—
:
B5
0
0
0
0
0
0
:
B3
1
0
0
0
0
0
:
B2
1
0
0
0
0
1
:
B1
1
0
0
1
1
0
:
B0
1
0
1
0
1
0
:
15
16
17
18
19
20
:
15
16
17
18
19
20
:
0Fh
10h
11h
12h
13h
14h
:
0
1
1
1
1
1
:
48
49
50
48
49
50
30h
31h
32h
—
—
—
—
—
—
—
—
—
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
0
1
0
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