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Using the STK526
Figure 2-21 . EXP.CON 0 and EXP.CON 1 Connectors
GND
n.c. ( AUXI0 )
n.c. ( CT7 )
n.c. ( CT5 )
n.c. ( CT3 )
n.c. ( CT1 )
n.c.
NRST
PG1
GND
VTG
PC7
PC5
PC3
PC1
PA7
PA5
PA3
PA1
GND
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
GND
n.c. ( AUXO0 )
n.c. ( CT6 )
n.c. ( CT4 )
n.c. ( CT2 )
n.c. ( BSEL2 )
REF
PG2
PG0
GND
VTG
PC6
PC4
PC2
PC0
PA6
PA4
PA2
PA0
GND
GND
n.c. ( AUXI1 )
n.c. ( DATA7 )
n.c. ( DATA5 )
n.c. ( DATA3 )
n.c. ( DATA1 )
n.c. ( SI )
n.c. ( SCK )
XT1
VTG
GND
PB7
PB5
PB3
PB1
PD7
PD5
PD3
PD1
GND
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
GND
n.c. ( AUXO1 )
n.c. ( DATA6 )
n.c. ( DATA4 )
n.c. ( DATA2 )
n.c. ( DATA0 )
n.c. ( SO )
n.c. ( CS )
XT2
VTG
GND
PB6
PB4
PB2
PB0
PD6
PD4
PD2
PD0
GND
EXP. CON 0
Top View
EXP. CON 1
2.7.3
2.7.4
2.8
2.8.1
2-18
Main Clock from STK500
The AVR clock frequency (external) coming from STK500 (XT1/XT2) can also be
controlled from AVR Studio?.
“STKX1” and ”STKX2” jumpers should be closed
RESET from STK500
The AVR RESET coming from STK500 (NRST - EXP.CON 0) can also control the
STK526.
In-System Programming
Programming with USB bootloader: DFU (Device Firmware Upgrade)
AT90USB82/162 part comes with a default factory pre-programmed USB bootloader
located in the on-chip boot section of the AT90USB82/162. This is the easiest and
fastest way to reprogram the device directly over the USB interface. The “Flip” PC-
based application offers a flexible and user friendly interface to reprogram the
application over the USB bus.
The HWB pin of the AT90USB82/162 allows to force the bootloader execution after
reset. (Please refer to AT90USB82/162 datasheet section “Bootloader support”). To
force bootloader execution, operate as follows:
Press both “RST” and “HWB” push buttons
First release the “RST” push button
Then release the “HWB” push button
STK526 rev. B Hardware User Guide
7709B–AVR–07/08
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