32186 datasheet(439/1032 Pages) RENESAS

439 / 1032 page

MULTIJUNCTION TIMERS

10-143

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

(3) Multiply-by-4 event count mode

In multiply-by-4 event count mode, the timer uses two external input signals in pairs (TIN24 and TIN25 or

TIN26 and TIN27) as the clock sources for the counter. The count direction is switched between up-count

and down-count depending on the status of the two input signals.

By detecting the rising and falling edges on both of the two external input signals, the timer generates clock

pulses synchronized to the microcomputer’s internal clock. When after setting the counter the timer is en-

abled (by writing to the enable bit in software), the counter starts counting synchronously with the generated

clock. To know whether the counter counts up or counts down, see Table 10.7.2 below.

An interrupt request and a DMA transfer request can be generated when the counter underflows or overflows.

To stop the counter, disable count by writing to the enable bit in software or fix the external input signals

either "H" or "L."

Table 10.7.2 Count Direction during Multiply-by-4 Event Count Mode

TIN24

(TIN26)

TIN25

(TIN27)

Input

Up-count

Down-count

Count Direction

10.7 TID (Input-Related 16-Bit Timer)

32186 Datasheet(PDF) 439 Page - Renesas Technology Corp