參數(shù)資料
型號: HD404618FS
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer
中文描述: 4位單片機
文件頁數(shù): 65/89頁
文件大?。?/td> 358K
代理商: HD404618FS
HD404618 Series
65
VT
ref
GND
Time slots
1 2 3
4 5
6 7 8 9 10
12
11
13 14 15 16
18 19
17
20 21 22 23 24 25 26 27 28 29 30 31 32
Figure 42 Waveform of Tone Output
Table 32 Frequency Deviation of the MCU from Standard DTMF Signals
Standard
DTMF (Hz)
MCU (Hz)
Deviation from
Standard (%)
R1
697
694.44
–0.37
R2
770
769.23
–0.10
R3
852
851.06
–0.11
R4
941
938.97
–0.22
C1
1,209
1,212.12
0.26
C2
1,336
1,333.33
–0.20
C3
1,477
1,481.48
0.30
C4
Note:
1,633
1,639.34
0.39
This frequency deviation value does not include the frequency deviation due to the oscillator
element. Also note that in this case the ratio of the high level and low level widths in the oscillator
waveform due to the oscillator element will be 50% : 50%.
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