參數(shù)資料
型號: 37C672
廠商: SMSC Corporation
英文描述: ENHANCED SUPER I/O CONTROLLER WITH FAST IR
中文描述: 增強(qiáng)的超級I / O控制器,快速紅外線
文件頁數(shù): 146/173頁
文件大?。?/td> 965K
代理商: 37C672
APPLICATION
2.2 Timer
2-17
3802 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 P55/CNTR1 pin by a timer.
A referance value
Specifications : The pulse is input to the P55/CNTR1 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 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 .
V227 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 s or more
(14 kHz or less)
71.4 s
(14 kHz)
50 s
(20 kHz)
50 s or less
(20 kHz or more)
Invalid
Valid
Invalid
2 ms
71.4 s
= 28 counts
2 ms
50 s
= 40 counts
Fig 2.2.17 A method for judging if input pulse exists
V
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