7534 datasheet(89/221 Pages) RENESAS

89 / 221 page

APPLICATION

7534 Group

2.2 Timer

Rev.3.00

Oct 23, 2006

page 20 of 78

REJ09B0178-0300

(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) = 6.00 MHz into about 2 kHz

(1995 Hz), is output from the P14/CNTR0 pin.

•The level of the P14/CNTR0 pin is fixed to “H” while a piezoelectric buzzer output

stops.

Figure 2.2.14 shows a peripheral circuit example, and Figure 2.2.15 shows the timers connection and

setting of division ratios. Figures 2.2.16 shows the relevant registers setting, and Figure 2.2.17

shows the control procedure.

Fig. 2.2.14 Peripheral circuit example

Fig. 2.2.15 Timers connection and setting of division ratios

7534 Group

P14/CNTR0

PiPiPi.....

250

µs

CNTR0 output

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

250

µs

Set a division ratio so that the

underflow output period of the timer X

can be 250

µs.

1/16

1/94

1/2

CNTR0

f(XIN) = 6.00 MHz

Timer X count source

selection bit

Prescaler X

Timer X

Fixed

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