CT-161-CD Fujitsu Semiconductor America Inc, CT-161-CD Datasheet - Page 60

• Manufacturer Part Number: CT-161-CD
• Description: KIT 16LX FOR MB90F387
• Manufacturer: Fujitsu Semiconductor America Inc
• Series: F²MC-16LXr
• Type: MCUr

Specifications of CT-161-CD

• Contents: Board, Cable, CD
• For Use With/related Products: MB90F387S
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 865-1103

4 “Let's try to sound a buzzer!”
Our daily life is full of sounds. Many of them are not natural sounds but artificial sounds that
give us signals, draw our attention to something, and give us information. The loud sound of the
alarm clock wakes us up every morning. The cooking timer buzzer sounds to let us know when
to stop boiling eggs for our favorite softness of yolk. We are surrounded and given much
information by artificial sounds varied in loudness and tone, including those of microwave ovens,
level crossing alarms, and automobile horns.
Microcomputers are often used to produce these artificial sounds. A microcomputer can be used
to control the timing, tone, and pitch of a sound. This chapter explains how to control a buzzer
sound simply by using microcomputer functions.
4.1
Before explaining the mechanism of a buzzer, this section describes the piezoelectric device
that is used for a buzzer.
A piezoelectric device is a circuit element that uses a piezoelectric effect. The piezoelectric
device incorporates a substance characterized by the piezoelectric effect (which causes a
voltage when an impact or pressure is applied) or the inverse piezoelectric effect (which
causes a crystalline distortion when a voltage is applied).
A quartz oscillator is a familiar example of piezoelectric device that uses the piezoelectric
characteristics.
incorporates this piezoelectric device. Piezoelectric devices are also used for piezoelectric
loudspeakers, crystal earphones, vibration sensors, and microphones.
Devices used for buzzer
The buzzer to be controlled by the microcomputer of the Starter Kit
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