UPD78F9500MA-CAC-A Datasheet, PDF (132/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00 (μPD78F920x ONLY)
(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 (fsam)
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).
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User’s Manual U18172EJ3V0UD