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參數(shù)資料
| 型號(hào)： | S1C88409D |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.8 MHz, MICROCONTROLLER, UUC108 |
| 封裝： | DIE-108 |
| 文件頁(yè)數(shù)： | 70/250頁(yè) |
| 文件大?。?/td> | 1877K |
| 代理商： | S1C88409D |
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S1C88409 TECHNICAL MANUAL
EPSON
151
CHAPTER 5: PERIPHERAL CIRCUITS AND OPERATION (Sound Generator)
5.15.3 Setting of buzzer frequency
and sound level
The BZ signal is a divided signal using the OSC1
oscillation circuit (32.768 kHz) as the clock source
and 8 frequencies can be selected. This selection is
done by the buzzer frequency selection register
BZFQ0–BZFQ2. The setting value and buzzer
frequency correspondence is shown in Table
5.15.3.1.
Table 5.15.3.1 Buzzer signal frequency settings
BZFQ2
Buzzer frequency (Hz)
0
1
4096.0
3276.8
2730.7
2340.6
2048.0
1638.4
1365.3
1170.3
BZFQ1
0
1
0
1
BZFQ0
0
1
0
1
0
1
0
1
By selecting the duty ratio of the BZ signal from
among 8 types, the buzzer sound level can be
adjusted. This selection is made in the duty ratio
selection register DUTY0–DUTY2. The setting
value and duty ratio correspondence is shown in
Table 5.15.3.2.
Table 5.15.3.2 Duty ratio settings
Level
Level 1 (Max)
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8 (Min)
12/28
11/28
10/28
9/28
8/28
7/28
6/28
5/28
4096.0
2048.0
3276.8
1638.4
2730.7
1365.3
2340.6
1170.3
DUTY0
DUTY2
DUTY1
8/20
7/20
6/20
5/20
4/20
3/20
2/20
1/20
0
1
0
1
0
1
0
1
0
1
8/16
7/16
6/16
5/16
4/16
3/16
2/16
1/16
12/24
11/24
10/24
9/24
8/24
7/24
6/24
5/24
0
1
0
1
Duty ratio by buzzer frequencies (Hz)
Duty ratio refers to the ratio of pulse width to the
pulse cycle; given that HIGH level output time is
TH, and low level output time is TL the BZ signal
becomes TL/(TH+TL).
When DUTY0–DUTY2 have all been set to "0", the
duty ratio becomes maximum and the sound level
also becomes maximum. Conversely, when
DUTY0–DUTY2 have all been set to "1", the duty
ratio becomes minimum and the sound level also
becomes minimum.
Note that the duty ratio setting differ depending
on frequency. See Table 5.15.3.2.
5.15.4 Digital envelope
A digital envelope with duty control can be added
to the BZ signal.
The envelope can be realized by staged changing
of the same duty ratio as detailed in Table 5.15.3.2
in the preceding section from level 1 (maximum)
to level 8 (minimum).
The addition of an envelope to the buzzer signal
can be done by writing "1" to the envelope control
register ENON. When "0" is written, the duty ratio
is set at the level selected in DUTY0–DUTY2.
By writing "1" to ENON and turning the buzzer
output ON (writing "1" to BZON), a BZ signal with
a level 1 duty ratio is output, and then the duty
ratio can be attenuated in stages to level 8. The
attenuated envelope can be returned to level 1 by
writing "1" to the envelope reset bit ENRST. When
attenuated to level 8, the duty level remains at
level 8 until the buzzer output is turned OFF
(writing "0" to BZON) or writing "1" to ENRST.
The stage changing time for the envelope level can
be selected either 125 msec or 62.5 msec by the
envelope attenuation time selection register
ENRTM.
Figure 5.15.4.1 shows the timing chart of the
digital envelope.
Level 1 (MAX)
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8 (MIN)
TH TL
Fig. 5.15.3.1 Duty ratio of buzzer signal waveform
Note: When using the digital envelope, the
DUTY0–DUTY2 setting becomes invalid.
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