參數(shù)資料
型號(hào)： M3826AMFA-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 10 MHz, MICROCONTROLLER, PQFP100
封裝： PLASTIC, LQFP-100
文件頁數(shù)： 38/95頁
文件大?。?/td> 1006K
代理商： M3826AMFA-XXXFP
Rev.2.00
May. 24, 2006
page 41 of 90
REJ03B0028-0200
3826 Group (A version)
DTMF Function (Dual Tone Multi Frequency)
DTMF function is used to output the result which generated auto-
matically the waveform of sine wave of two kinds of different
frequency, and added two kinds of this sine wave as an analog
value.
DTMF output waveform can be output from DA1 pin. DTMF wave-
form is output by setting “1” (enabled) to the DTMF/DA1 output
enable bit (bit 0 of address 003616), and setting “1” to the DTMF/
DA1 selection bit (bit 2 of address 003616). At this time, set “0” (in-
put state) to the direction register of ports P56/DA1 pin and pull-up
resistor to be OFF state.
In order to set two kinds of frequency which generates DTMF
waveform, write a value in the DTMF high group timer and the
DTMF low group timer, respectively. The value written in each
above-mentioned timer is n, the sine wave of the following fre-
quency can be generated.
f =
(Hz)
Set “0616” or more to the DTMF high group timer and the DTMF
low group timer. After reset release, “0616” is automatically set to
them.
f(XIN)/2
(n+1) 32
The digital value for one period of high group and low group out-
put is shown in Figure 43.
DTMF output is automatically input to high-order 6 bits of the D/A1
conversion register as 6-bit D/A data. The low-order 2 bits of the
D/A1 conversion register are fixed to the value written in the D/A1
conversion register.
Moreover, only the sine wave of high group can be output by set-
ting “1” to the bit 4 of the D/A control register. By setting “1” to the
bit 5 of the D/A control register similarly, only the sine wave of low
group can be output. Writing to the DTMF high group timer and
the DTMF low group timer can also be changed to “writing to latch
and timer simultaneously” by setting “1” to the bit 6 of the D/A con
trol register. “Writing to only latch” is set after reset release. If the
D/A1 conversion register is read when the DTMF function is
selected,the digital value of DTMF output can be read.
Fig. 43 Waveform data of high group and low group
DA
1
value
(8bit)
*
0
5
10
15
20
25
30
1416
2816
3C16
5016
6416
7816
016
0
5
10
15
20
25
30
DA
1
value
(8bit)
*
1416
2816
3C16
5016
6416
7816
016
DA data of low group waveform (1 period) for DTMF
DA data of high group waveform (1 period) for DTMF
* This is the value set to DA1 conversion register when the low-order 2 bits are “0”.
Conversion time of high group ROM
Conversion time of low group ROM
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