參數(shù)資料
型號： M38000E7-XXXSP
廠商： Mitsubishi Electric Corporation
元件分類： DC/DC變換器
英文描述： 1 watt dc-dc converters
中文描述： 1瓦的DC - DC轉(zhuǎn)換器
文件頁數(shù)： 65/173頁
文件大?。?/td> 4203K
代理商： M38000E7-XXXSP
APPLICATION
2.2 Timer
2-17
3800 GROUP USER’S MANUAL
(4) Timer application example 3 : Measurement of frequency
Outline :
The following two values are compared for judging if the frequency is within a certain range.
A value counted a pulse which is input to P5
5
/CNTR
1
pin by a timer.
A referance value
Specifications :
The pulse is input to the P5
5
/CNTR
1
pin and counted by the Timer Y.
A count value is read out at the interval of about 2 ms (Timer 1 interrupt interval
: 244
μ
s
8). When the count value is 28 to 40, it is regarded the input pulse
as a valid.
Because the timer is a down-counter, the count value is compared with 227 to 215
8
.
8
227 to 215 = 255 (initialized value of counter) – 28 to 40 (the number of valid
value).
Figure 2.2.17 shows a method for judging if input pulse exists, and Figure 2.2.18 shows a setting of
related registers.
Input pulse
71.4
μ
s or more
(14 kHz or less)
71.4
μ
s
(14 kHz)
50
μ
s(20 kHz)
50
μ
s or less
(20 kHz or more)
Invalid
Valid
Invalid
2 ms
71.4
μ
s
= 28 counts
2 ms
50
μ
s
= 40 counts
Fig 2.2.17 A method for judging if input pulse exists
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