M38K09RFS datasheet(160/328 Pages) RENESAS

160 / 328 page

2.3 Timer

Rev.2.00

Oct 05, 2006

page 31 of 111

38K0 Group

REJ09B0337-0200

APPLICATION

(3)

Timer application example 2: Piezoelectric buzzer output

Outline: The rectangular waveform output function of the timer is applied for a piezoelectric buzzer

output.

Specifications: •The rectangular waveform, dividing the clock f(XIN) = 6 MHz into about 2 kHz (2038

Hz), is output from the P51/CNTR0 pin.

•The level of the P51/CNTR0 pin is fixed to “H” while a piezoelectric buzzer output

stops.

Figure 2.3.13 shows a peripheral circuit example, and Figure 2.3.14 shows the timers connection and

setting of division ratios. Figures 2.3.15 shows the related registers setting, and Figure 2.3.16 shows

the control procedure.

Fig. 2.3.13 Peripheral circuit example

Fig. 2.3.14 Timers connection and setting of division ratios

38K0 Group

P51/CNTR0

PiPiPi.....

245

µs

CNTR0

output

The “H” level is output while a piezoelectric buzzer output stops.

245

µs

Set a division ratio so that the

underflow output period of the timer X

can be 245

µs.

1/16

1/92

1/2

CNTR0

f(XIN) = 6 MHz

Fixed

Prescaler X

Timer X

Fixed

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