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參數(shù)資料
| 型號： | MC68HC05F4FB |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁數(shù)： | 96/130頁 |
| 文件大小： | 2089K |
| 代理商： | MC68HC05F4FB |
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MOTOROLA
7-2
MC68HC05F4
DTMF/MELODY GENERATOR
7
7.2
Functional description
As shown in Figure 7-1, the DMG consists of 2 tone generation paths (the column and row paths).
One path generates the row tone and the other the column tone, whose frequencies are
determined by the values in the frequency control registers FCR and FCC respectively. The tones
allowed at the TNO output are single/dual sine/square wave tones of DTMF and melody
frequencies, whereas at the TNX output, only single square wave tones are allowed. The method
of tone generation for the two paths is almost the same, and is described as follows.
To generate a sine wave tone with programmable frequency in a path, the internal clock (i.e. the
3.58MHz/2) is rst divided by a frequency divider according to a number on the register (FCR or
FCC). The output of the divider is a periodic pulse train whose frequency is the sampling rate of
the desired ‘staircase sine wave’. This pulse train, in turn, clocks a divide-by-28 binary counter
(PLA scanner) whose 28 decoded outputs scan sequentially 28 memory locations of a 28x6 sine
wave generator (PLA) in 28 time steps (M). The six resulting digital sine wave bits are then fed
separately to a 6-bit resistor ladder to produce a current signal.
The method for generating a square wave tone in a path is similar to that of a sine wave tone
except that only the most signicant bit of a sine wave PLA is fed to the 6-bit resistor ladder to
produce a current signal (the other 5 least signicant bits are masked by the sine/square wave
select). Using this method, a square wave tone can be produced which has exactly the same
frequency and phase as a sine wave tone, and uses the same frequency control register value.
After obtaining the current signals from the row and column paths, the row current signal is rst
attenuated by 2dB. It is then summed with the column current signal, and is nally fed to an active
7 KHz low pass lter to reduce harmonic distortion (note that square wave tones are also passed
through this lter). The resulting DTMF or melody signal is output through the TNO pin which is
normally connected to a speech circuit.
The generator provides not only DTMF and melody but also a square wave pacier tone (ToneX).
This signal is also extracted from the most signicant bit of the sine wave PLA of the row path, but
is not passed through the lter. The ToneX signal is output through the TNX pin which is normally
connected to a loudspeaker.
TPG
64
05F4Book Page 2 Tuesday, August 5, 1997 1:10 pm
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC05F5 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS Microcontroller Unit |
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| MC68HC05F8 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor(HCMOS) microcontroller unit |
| MC68HC05J1 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
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