UPD784938 Datasheet, PDF (276/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 10 TIMER/EVENT COUNTER 1
(5) Edge detection circuit
The edge detection circuit detects an external input valid edge.
When the valid edge set by external interrupt mode register 0 (INTM0) is detected in the INTP0 pin input, the external
interrupt request (INTP0), a capture trigger and a count clock of the external event are generated (see Figure 22-1 for details
of the INTM0).
(6) Prescaler
The prescaler generates the count clock from the internal system clock. The clock generated by this prescaler is selected
by the selector, and is used as the count clock by the timer counter 1 (TM1/TM1W) to perform count operations.
(7) Selector
The selector selects a signal resulting from dividing the internal clock or the edge detected by the edge detection circuit as
the count clock of timer counter 1 (TM1/TM1W).
276
Preliminary User’s Manual U13987EJ1V0UM00