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Using the STK526
Figure 2-18 . LEDs Implementation Schematic
In-line Grouped LEDs
1k
R1
LED 0 (green)
PD[7..0]
PD0
TOPLED LP M676
D0
2.6.3
Data Flash Memory
1k
1k
1k
R2
R3
R4
LED 1 (green)
TOPLED LP M676
LED 2 (green)
TOPLED LP M676
LED 3 (green)
TOPLED LP M676
D1
D2
D3
PD1
PD4
PD5
For USB Mass-storage class demonstration purposes, the STK526 provides an on-chip
serial Flash memory (AT45DB642x) connected to the AT90USB82/162 Serial Port
Interface (SPI).
The data-flash chip select signal is connected to PortC bit 2 of the AT90USB82/162
(See Figure 2-19).
Figure 2-19 . On-board data flash schematic
PB[7..0]
PB3
3.3V
PB2
PB1
R13
10k
R123
47k
U9
3.3V
PC2
1
2
3
4
SI
SCK
RESET
CS
SO
GND
VCC
WP
8
7
6
5
C8
AT45DB642D CASON8
47k R14
100nF
C123
Although the dataflash is 3.3V powered, it withstands without problem 5V level signals.
2-16
7709B–AVR–07/08
STK526 rev. B Hardware User Guide
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