UPD78F9234MC-5A4-A Datasheet, PDF (130/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00
(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 22 and
CHAPTER 23 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 U17446EJ5V0UD