AT88CK109STK3 データシートの表示（PDF） - Atmel Corporation

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AT88CK109STK3

AVR®-based AT88CK109BSTK3 CryptoAuthentication Starter Kit

Atmel Corporation 

K1

TWI Position

TWI

SPI

K1

SPI Position

TWI

SPI

3.6 On-board Resources

3.6.1

Description of LED Bank

The AT88Microbase includes 3 general purpose red LEDs, which are connected to PD6, PD5 and

PD4. To light an LED, the corresponding port pin must be driven high. To turn off an LED, the

corresponding port pin must be driven low.

Figure 8. LEDs Implementation Schematic

Note: AVR can source or sink enough current to drive an LED directly.

3.6.2

Buzzer

The small onboard buzzer adds audio capability to the AT88Microbase board. The buzzer requires

that PD7 be driven with a square wave at 4.0  0.5 KHz to achieve a maximum decibel of 78dB.

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