CHAPTER 14 PORT FUNCTIONS
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User’s Manual U14492EJ3V0UD
14.4.3 Timer 2 input pins
A noise eliminator using analog filtering and digital filtering using clock sampling are added to the timer 2 input
pins. A signal input that changes in less than these elimination times is not accepted internally.
Digital Filter
Pin
Analog Filter Noise
Elimination Time
Noise Elimination Time
Sampling Clock
P20/TI2/INTP20
P21/TO21/INTP21 to P24/TO24/INTP24
P25/TCLR2/INTP25
10 to 100 ns
4 to 5 clocks
f
XXTM2
Cautions 1.
Since digital filtering uses clock sampling, if it is selected, input signals are not received
when the CPU clock is stopped.
2.
The noise eliminator is valid only in control mode.
3.
Refer to Figure 14-14 for an example of a noise eliminator.
Remark
f
XXTM2
: Clock of TM20 and TM21 selected by PRM02 register
Содержание V850E/IA1 mPD703116
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