M38K09RFS datasheet(157/328 Pages) RENESAS

157 / 328 page

2.3 Timer

Rev.2.00

Oct 05, 2006

page 28 of 111

38K0 Group

REJ09B0337-0200

APPLICATION

2.3.3 Timer application examples

(1)

Basic functions and uses

[Function 1] Control of Event interval (Timer X, Timer 1, Timer 2)

When a certain time, by setting a count value to each timer, has passed, the timer interrupt request

occurs.

<Use>

•Generation of an output signal timing

•Generation of a wait time

[Function 2] Control of Cyclic operation (Timer X, Timer 1, Timer 2)

The value of the timer latch is automatically written to the corresponding timer each time the timer

underflows, and each timer interrupt request occurs in cycles.

<Use>

•Generation of cyclic interrupts

•Clock function (measurement of 10 ms); see Application example 1

•Control of a main routine cycle

[Function 3] Output of Rectangular waveform (Timer X)

The output level of the CNTR0 pin is inverted each time the timer underflows (in the pulse output

mode).

<Use>

•Piezoelectric buzzer output; see Application example 2

•Generation of the remote control carrier waveforms

[Function 4] Count of External pulses (Timer X)

External pulses input to the CNTR0 pin are counted as the timer count source (in the event counter

mode).

<Use>

•Frequency measurement; see Application example 3

•Division of external pulses

•Generation of interrupts due to a cycle using external pulses as the count source; count of a

reel pulse

[Function 5] Measurement of External pulse width (Timer X)

The “H” or “L” level width of external pulses input to CNTR0 pin is measured (in the pulse width

measurement mode).

<Use>

•Measurement of external pulse frequency (measurement of pulse width of FG pulse✽ for a

motor); see Application example 4

•Measurement of external pulse duty (when the frequency is fixed)

FG pulse✽: Pulse used for detecting the motor speed to control the motor speed.

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