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| 型號： | EM6821TQ52B |
| 英文描述： | Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: 0°C to 70°C; Package: 8-EPSOIC |
| 中文描述： | 微控制器 |
| 文件頁數(shù)： | 21/69頁 |
| 文件大?。?/td> | 852K |
| 代理商： | EM6821TQ52B |
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EM6821
10/01, Revision A/386
Copyright
2001, EM Microelectronic-Marin SA
28
www.emmicroelectronic.com
7.1.1 Single Run Mode
The RegMelPeri value and the selected timer frequency in RegMelTim control the timer duration. The timer is
counting down from its previously charged value until it reaches 0. On 0 the timer stops and generates an
interrupt request. The buzzer frequency output is enabled after the next positive timer clock edge and remains
enabled until the timer reaches 0.
7.1.2 Continuos Run Mode
This is almost the same as the single run mode only that in this case the timer after reaching 0 reloads itself
automatically with the register RegMelPeri value. Every time the timer reaches 0 an interrupt request is send.
There are 2 ways to stop the continuos mode.
First, changing the mode to single run mode. As the timer reaches 0 it stops. The last period after Auto=0 is
of length RegMelPeri + 1.
Second, loading 0 into the timer period register RegMelPeri stops the timer immediately, no interrupt is
generated and the Auto flag is reset. The buzzer frequency output is enabled directly by writing Auto=1.
Figure 20. Single Run Mode
2
10
0
1
P writes 2 into
RegMelPeri
P writes 1 into
RegMelPeri
Timer Clock
Timer Value
Buzzer
IRQBz
Figure 21. Continuos Run Mode
2
21
0
1
2
0
1
P writes
Auto = 0
P writes
Auto = 1
P writes 2
into
RegMelPeri
Timer Clock
n periods
n+1 periods
Timer Value
Buzzer
IRQBz
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