Datasheet

CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00 ( μ PD78F920x ONLY)
User’s Manual U18172EJ3V0UD
130
(23) External clock limitation
<1> When using an input pulse of the TI000 pin as a count clock (external trigger), be sure to input the pulse
width which satisfies the AC characteristics. For the AC characteristics, refer to CHAPTER 19
ELECTRICAL SPECIFICATIONS.
<2> When an external waveform is input to 16-bit timer/event counter 00, it is sampled by the noise limiter
circuit and thus an error occurs on the timing to become valid inside the device.
Count clock (f sam )
TI000
Input pulse through
noise limiter circuit
Sampling time on filter
Remark The count clock (fsam) can be selected using bits 0 and 1 (PRM000, PRM001) of prescaler
mode register 00 (PRM00).