Timer 2 Input Pins - NEC V850E/IA1 mPD703116 User Manual

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.
Pin
P20/TI2/INTP20
P21/TO21/INTP21 to P24/TO24/INTP24
P25/TCLR2/INTP25
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 : Clock of TM20 and TM21 selected by PRM02 register
XXTM2
718
CHAPTER 14 PORT FUNCTIONS
Analog Filter Noise
Elimination Time
10 to 100 ns 4 to 5 clocks
User's Manual U14492EJ3V0UD
Digital Filter
Noise Elimination Time
f
XXTM2
Sampling Clock