7641 datasheet(151/385 Pages) RENESAS

151 / 385 page

Rev.2.00

Aug 28, 2006

page 20 of 148

7641 Group

REJ09B0336-0200

APPLICATION

2.2 Timer

2.2.3 Timer application examples

(1) Basic functions and uses

[Function 1] Control of event interval (Timer 1 to Timer 3, Timer X and Y: Timer mode)

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

<Use>

•Generating of an output signal timing

•Generating of a wait time

[Function 2] Control of cyclic operation (Timer 1 to Timer 3, Timer X and Y: Timer mode)

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>

•Generating of cyclic interrupts

•Clock function (measurement of 1 s); see “(2) Timer application example 1”

•Control of a main routine cycle

[Function 3] Output of rectangular waveform

(Timer 1, Timer 2, Timer X: Pulse output mode; Timer Y: TYOUT output)

The output levels of the TOUT, CNTR0 and CNTR1 pins are inverted each time the timer underflows.

<Use>

•Piezoelectric buzzer output; see “(3) Timer application example 2”

•Generating of the remote control carrier waveforms

[Function 4] Count of external pulses (Timer X, Timer Y: Event counter mode)

External pulses input to the CNTR0 pin and CNTR1 pin are respectively counted as the timer count

source (in the event counter mode).

<Use>

•Frequency measurement; see “(4) Timer application example 3”

•Division of external pulses

•Generating 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 1 (Timer X: Pulse width measurement mode)

The “H” or “L” level width of external pulses input to CNTR0 pin is measured.

<Use>

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

see “(5) Timer 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.

[Function 6] Measurement of external pulse width 2 (Timer Y: Period measurement mode)

The external pulse width input to CNTR1 pin is measured.

<Use>

•Measurement of phase control signal; see “(6) Timer application example 5”

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