3822 datasheet(121/328 Pages) RENESAS

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2.3 Timer X and timer Y

APPLICATION

2–55

3822 GROUP USER’S MANUAL

sTimer Y counter

The Y counter counts the count source. Figure 2.3.15 shows the structure of the timer Y counter.

The contents of the Y counter are decremented by 1 each time a count source is input.

The division ratio of the counter is represented by the following expression.

Division ratio of the Y counter =

In the period measurement mode or the pulse width HL coutinuously measurement mode, the value

immediately before reload is held until it is read out once after reload. The count operation is coutinued.

Fig. 2.3.15 Structure of timer Y counter

the X counter initial value + 1

b7 b6 b5 b4 b3 b2 b1 b0

Timer Y (high-order, low-order) (TYH, TYL) [Address 23 16, 2216]

Functions

At reset R W

Timer Y (high-order, low-order)

•Set “000016 to FFFF16” as timer Y count value.

•The value of the Y counter is decremented

by 1 each time a count source is input.

•The values of each Y counter are read out

by reading the respective timer Ys.

•The Y counter value immediately before

reload is held until it is read out once after

reload.

(period measurement mode/pulse width HL

continuously measurement mode)

qTimer Y counter

Notes 1 : Write both registers in the order of TYL and TYH.

2 : Read both registers in the order of TYH and TYL.

3822 Datasheet(PDF) 121 Page - Renesas Technology Corp