SMT-0540-S-R datasheet(11/38 Pages) ATMEL

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SMT-0540-S-R 数据表(PDF) 11 Page - ATMEL Corporation

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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.

SPI

TWI

SPI

TWI

TWI Position

SPI Position

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