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
K1
TWI Position
K1
SPI Position
Summary of Contents for AT88CK109STK3
Page 1: ...AT88CK109STK3 Hardware User Guide 8557B CRYPTO 04 09 ...
Page 26: ...Figure 2 AT88Microbase Schematic 2 of 4 ...
Page 28: ...Figure 4 AT88Microbase Schematic 4 of 4 ...
Page 30: ...Figure 6 AT88Microbase Assembly Drawing 2 of 2 Bottom side ...
Page 32: ...Figure 7 AT88CK109BK3 Schematic 1 of 3 ...
Page 34: ...Figure 9 AT88CK109BK3 Schematic 3 of 3 ...
Page 36: ...Figure 10 AT88CK109BK3 Assembly Drawing 2 of 2 Bottom side ...
