參數(shù)資料
型號: M38001M8-XXXHP
廠商: Mitsubishi Electric Corporation
英文描述: Quad Low-Noise High-Speed Precision Operational Amplifier 16-SOIC
中文描述: 8位單片機
文件頁數(shù): 68/173頁
文件大?。?/td> 4203K
代理商: M38001M8-XXXHP
2-20
3800 GROUP USER’S MANUAL
APPLICATION
2.2 Timer
(5) Timer application example 4 : Measurement of pulse width of FG pulse generated by motor
Outline :
The “H” level width of a pulse input to the P5
4
/CNTR
0
pin is counted by Timer X. An
underflow is detected by Timer X interrupt and an end of the input pulse “H” level is detected
by CNTR
0
interrupt.
Specifications :
The “H” level width of a FG pulse input to the P5
4
/CNTR
0
pin is counted by Timer
X.
(Example : When the clock frequency is 4.19 MHz, the count source would be
3.8
μ
s that is obtained by dividing the clock frequency by 16.
Measurement can be made up to 250 ms in the range of FFFF
16
to
0000
16
.)
Figure 2.2.20 shows a connection of the timer and a setting of the division ratio, and Figure 2.2.21
shows a setting of related registers.
Fig. 2.2.20 Connection of the timer and setting of the division ratio [Measurement of pulse width]
f(X
IN
)
=
4.19 MHz
Fixed
Prescaler X
Timer X
Timer X interrupt request bit
250 ms
0 : No interrupt request
1 : Interrupt request
1/16
0 or 1
1/256
1/256
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