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參數(shù)資料
| 型號： | M44C510D-XXX-DOW |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, MICROCONTROLLER |
| 封裝： | SSOP-44 |
| 文件頁數(shù)： | 33/60頁 |
| 文件大?。?/td> | 709K |
| 代理商： | M44C510D-XXX-DOW |
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M44C510E
Preliminary Information
Rev. A1, 04-May-00
39 (60)
Melody Mode (with/without Modulation)
The non-modulated melody mode is identical to the auto- reload counter (50% duty cycle) mode. The melody tone
frequency appearing on BP41 and/or BP40 is determined in exactly the same way as the value written into the
comparator register. In the modulated melody mode, the M44C510E generates two output signals, a melody tone and
an envelope pulse (see figure 32). The tone frequency output on BP41 is generated in exactly the same way as in the
simple melody mode. While the envelope pulse on BP40 is a single pulse, of a clock period in duration which appears
shortly after loading the compare value into the compare register. In this mode, an analog switch is activated between
the BP40 and BP41 outputs (see figure 33). With the external capacitor connected, the resultant signal on BP41 exhibits
a melody chime effect with an exponential decay.
Timer
Clock
T0OUT0
(BP40)
Compare
Interrupt
Timer = compare register
resets timer
0
7
Timer
State
0
T0OUT1
(BP41)
New value (=7) loaded
into compare register
4
1
2
35 6
0
7
4
1
2
35 6
0
7
4
1
2
35 6
0
7
4
1
2
35 6
7
4
1
2
35 6
96 11538
Figure 32. Modulated melody mode
T0OUT0
T0OUT1
V
Analog switch
Modulated
melody mode
BP41
BP40
T0OUT0
(melody output)
T0OUT1
(envelope)
BP40
BP41
V
10...47uF
R
(optional)
Piezo
buzzer
VDD
SS
DD
VSS
96 11539
Figure 33. Modulated melody output circuit
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