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| 型號(hào)： | S1C6F567D0A0100 |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | MICROCONTROLLER, UUC141 |
| 封裝： | DIE-141 |
| 文件頁(yè)數(shù)： | 8/208頁(yè) |
| 文件大小： | 1561K |
| 代理商： | S1C6F567D0A0100 |
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S1C6F567 TECHNICAL MANUAL
EPSON
97
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Sound Generator)
4.12.4 Setting of buzzer frequency and sound level
The divided signal of the OSC1 oscillation clock (32.768 kHz) is used for the buzzer (BZ, XBZ) signals and
it is set up such that 8 types of frequencies can be selected by changing this division ratio. Frequency
selection is done by setting the buzzer frequency selection registers BZFQ0–BZFQ2 as shown in Table
4.12.4.1.
Table 4.12.4.1 Buzzer signal frequency setting
Buzzer frequency (Hz)
4096.0
3276.8
2730.7
2340.6
2048.0
1638.4
1365.3
1170.3
BZFQ0
0
1
0
1
0
1
0
1
BZFQ1
0
1
0
1
BZFQ2
0
1
The buzzer sound level is changed by controlling the duty ratio of the buzzer signal.
The duty ratio can be selected from among the 8 types shown in Table 4.12.4.2 according to the setting of
the buzzer duty selection registers BDTY0–BDTY2.
Table 4.12.4.2 Duty ratio setting
BDTY0
0
1
0
1
0
1
0
1
BDTY1
0
1
0
1
BDTY2
0
1
Level
Level 1 (Max.)
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8 (Min.)
4096.0
2048.0
8/16
7/16
6/16
5/16
4/16
3/16
2/16
1/16
3276.8
1638.4
8/20
7/20
6/20
5/20
4/20
3/20
2/20
1/20
2730.7
1365.3
12/24
11/24
10/24
9/24
8/24
7/24
6/24
5/24
2340.6
1170.3
12/28
11/28
10/28
9/28
8/28
7/28
6/28
5/28
Duty ratio by buzzer frequency (Hz)
When the HIGH level output time has been made TH and when the LOW level output time has been made
TL due to the ratio of the pulse width to the pulse synchronization, the duty ratio becomes TL/(TH+TL)
for negative polarity or TH/(TH+TL) for positive polarity.
When BDTY0–BDTY2 have all been set to "0", the duty ratio becomes maximum and the sound level also
becomes maximum. Conversely, when BDTY0–BDTY2 have all been set to "1", the duty ratio becomes
minimum and the sound level also becomes minimum.
The duty ratio that can be set is different depending on the frequency that has been set, so see Table 4.12.4.2.
Level 1 (Max.)
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8 (Min.)
TH TL
Level 1 (Max.)
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8 (Min.)
TL TH
(a) Negative polarity
(b) Positive polarity
Fig. 4.12.4.1 Duty ratio of the buzzer signal waveform
Note: When a digital envelope has been added to the buzzer signal, the BDTY0–BDTY2 settings will be
invalid due to the control of the duty ratio.
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