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BR8F 参数 Datasheet PDF下载

BR8F图片预览
型号: BR8F
PDF下载: 下载PDF文件 查看货源
内容描述: [400mA 8.0kV 100nS High Voltage Medium and High Current Diodes]
分类和应用:
文件页数/大小: 58 页 / 442 K
品牌: HOLTIC [ HOLT INTEGRATED CIRCUITS ]
 浏览型号BR8F的Datasheet PDF文件第15页浏览型号BR8F的Datasheet PDF文件第16页浏览型号BR8F的Datasheet PDF文件第17页浏览型号BR8F的Datasheet PDF文件第18页浏览型号BR8F的Datasheet PDF文件第20页浏览型号BR8F的Datasheet PDF文件第21页浏览型号BR8F的Datasheet PDF文件第22页浏览型号BR8F的Datasheet PDF文件第23页  
HT46R01A  
Configuring the Timer Mode  
will increment each time the external timer pin receives  
a high to low transition. As in the case of the other two  
modes, when the counter is full, the timer will overflow  
and generate an internal interrupt signal. The counter  
will then preload the value already loaded into the  
preload register. As the external timer pins are  
pin-shared with other I/O pins, to ensure that the pin is  
configured to operate as an event counter input pin, two  
things have to happen. The first is to ensure that the  
T0M1/T0M0 bits place the Timer/Event Counter in the  
event counting mode, the second is to ensure that the  
port control register configures the pin as an input. It  
should be noted that a timer overflow is one of the inter-  
rupt and wake-up sources. Note that the timer interrupts  
can be disabled by ensuring that the ET0I bits in the  
INTC0 register are reset to zero.  
In this mode, the timer can be utilized to measure fixed  
time intervals, providing an internal interrupt signal each  
time the counter overflows. To operate in this mode, the  
bit pair, T0M1/T0M0, must be set to 1 and 0 respectively.  
In this mode the internal clock is used as the timer clock.  
The timer input clock source is either fSYS or the RTC os-  
cillator. However, this timer clock source is further di-  
vided by a prescaler, the value of which is determined by  
the bits T0PSC2~T0PSC0 in the Timer Control Regis-  
ter. The timer-on bit, T0ON must be set high to enable  
the timer to run. Each time an internal clock high to low  
transition occurs, the timer increments by one; when the  
timer is full and overflows, an interrupt signal is gener-  
ated and the timer will preload the value already loaded  
into the preload register and continue counting. A timer  
overflow condition and corresponding internal interrupt  
is one of the wake-up sources, however, the internal in-  
terrupts can be disabled by ensuring that the ET0I bits of  
the INTC0 register are reset to zero.  
Configuring the Pulse Width Measurement Mode  
In this mode, the width of external pulses applied to the  
external timer pin can be measured. In the Pulse Width  
Measurement Mode the timer clock source is supplied  
by the internal clock. For the timer to operate in this  
mode, the bit pair, T0M1/T0M0 must both be set high. If  
the T0E bit is low, once a high to low transition has been  
received on the external timer pin, the timer will start  
counting until the external timer pin returns to its original  
high level. At this point the T0ON bit will be automatically  
reset to zero and the timer will stop counting. If the T0E  
bit is high, the timer will begin counting once a low to  
high transition has been received on the external timer  
pin and stop counting when the external timer pin re-  
Configuring the Event Counter Mode  
In this mode, a number of externally changing logic  
events, occurring on the external timer pin, can be re-  
corded by the internal timer. For the timer to operate in  
the event counting mode, the bit pair, T0M1/T0M0 must  
be set to 0 and 1 respectively. The timer-on bit T0ON or  
T1ON, depending upon which timer is used, must be set  
high to enable the timer to count. If T0E is low, the coun-  
ter will increment each time the external timer pin re-  
ceives a low to high transition. If T0E is high, the counter  
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Pulse Width Measure Mode Timing Chart  
Rev. 1.10  
19  
August 13, 2008  
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