CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
User’s Manual U18172EJ2V0UD
121
(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 (f
sam
) can be selected using bits 0 and 1 (PRM000, PRM001) of
prescaler
mode register 00 (PRM00).