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參數(shù)資料
| 型號： | MC68HC05F8B |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 1.8 MHz, MICROCONTROLLER, PDIP56 |
| 封裝： | PLASTIC, SDIP-56 |
| 文件頁數(shù)： | 107/126頁 |
| 文件大?。?/td> | 1084K |
| 代理商： | MC68HC05F8B |
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MC68HC05F8
MOTOROLA
9-1
DTMF/MELODY GENERATOR
9
DTMF/MELODY GENERATOR
The DTMF/Melody Generator (DMG) is a multi-function tone generator built into the
MC68HC05F8 MCU, supporting DTMF dialling, melody-on-hold, and pacier tone functions. The
associated output pins are TONEOUT and TONEX.
9.1
Features
4 row and 4 column frequencies for DTMF dialling
24 row and 24 column frequencies for dual tone melody
28 frequencies for pacier tone to acknowledge button pressed for pulse dialling
Power saving mechanism for no tone condition
3.579MHz
÷ 2 operation
6-bit D/A converter and 28 time steps for sine wave generation
Sine wave or square wave selectable output for melody or DTMF
Single or dual tone capability for melody or DTMF
9.2
General Operation
In Figure 9-1, the DMG consists of a row tone and a column tone generation path. The tone
frequency of each path is controlled by their respective frequency control registers; Row
Frequency Control register (FCR) and Column Frequency Control register (FCC). At the
TONEOUT output, single/dual sine/square wave tones of DTMF and melody frequencies are
possible, whereas at the TONEX output, only single square wave tones are possible.
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, whose value is set by the frequency control
register (FCR or FCC). The output of the divider is a periodic pulse train whose frequency is the
TPG
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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