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參數(shù)資料
| 型號(hào)： | HD4074618FS |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | CONNECTOR |
| 中文描述： | 連接器 |
| 文件頁(yè)數(shù)： | 62/89頁(yè) |
| 文件大小： | 358K |
| 代理商： | HD4074618FS |
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HD404618 Series
62
DTMF Generation Circuit
The MCU has a dual-tone multifrequency (DTMF) generation circuit.
The DTMF signal consists of two sine waves to access the switching system.
Figure 39 shows the DTMF keypad and frequencies. Pressing a key generates a tone corresponding to its
frequency. Figure 40 shows a block diagram of the DTMF circuit.
The MCU uses an oscillation frequency reduced to 400 kHz, an eighth of the conventionally used
frequency, for low-power consumption. This, however, causes a potential frequency deviation. The MCU
provides transformed programmable dividers in addition to sine wave counters and a control register to
reduce frequency deviation.
The DTMF generation circuit is controlled by the following three registers.
1
4
7
*
2
5
8
0
3
6
9
#
A
B
C
D
R1 (697 Hz)
R2 (770 Hz)
R3 (852 Hz)
R4 (941 Hz)
C
C
C
C
Figure 39 DTMF Keypad and Frequencies
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD4074618H | 4-Bit Single-Chip Microcomputer |
| HD4074618TF | 4-Bit Single-Chip Microcomputer |
| HD4046212R | AS Microcomputer Incorporating a DTMF Generator Circuit(微計(jì)算機(jī)帶雙音多頻發(fā)生器電路) |
| HD404628R | AS Microcomputer Incorporating a DTMF Generator Circuit(微計(jì)算機(jī)帶雙音多頻發(fā)生器電路) |
| HD4074629 | AS Microcomputer Incorporating a DTMF Generator Circuit(微計(jì)算機(jī)帶雙音多頻發(fā)生器電路) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD4074618H | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD4074618TF | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD4074629 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a DTMF Generator Circuit |
| HD4074629F | 制造商:Renesas Electronics Corporation 功能描述: |
| HD4074629FS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
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