STK526 datasheet(19/40 Pages) ATMEL

19 / 40 page

Using the STK526

2-18

STK526 rev. B Hardware User Guide

7709B–AVR–07/08

Figure 2-21 . EXP.CON 0 and EXP.CON 1 Connectors

2.7.3

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

2.7.4

RESET from STK500

The AVR RESET coming from STK500 (NRST - EXP.CON 0) can also control the

STK526.

2.8

In-System Programming

2.8.1

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

EXP. CON 1

GND

1 2

n.c. (AUXI0)

n.c. (AUXO0)

3 4

n.c. (CT7)

n.c. (CT6)

5 6

n.c. (CT5)

n.c. (CT4)

7 8

n.c. (CT3)

n.c. (CT2)

9 10

n.c. (CT1)

n.c. (BSEL2)

11 12

n.c.

REF

13 14

NRST

PG2

15 16

PG1

PG0

17 18

GND

19 20

PC7

PC6

23 24

VTG

21 22

PC5

PC4

25 26

PC3

PC2

27 28

PC1

PC0

29 30

PA7

PA6

31 32

PA5

PA4

33 34

PA3

PA2

35 36

PA1

PA0

37 38

GND

39 40

GND

1 2

n.c. (AUXI1)

n.c. (AUXO1)

3 4

n.c. (DATA7)

n.c. (DATA6)

5 6

n.c. (DATA5)

n.c. (DATA4)

7 8

n.c. (DATA3)

n.c. (DATA2)

9 10

n.c. (DATA1)

n.c. (DATA0)

11 12

n.c. (SI)

n.c. (SO)

13 14

n.c. (SCK)

n.c. (CS)

15 16

XT1

XT2

17 18

VTG

19 20

PB7

PB6

23 24

GND

21 22

PB5

PB4

25 26

PB3

PB2

27 28

PB1

PB0

29 30

PD7

PD6

31 32

PD5

PD4

33 34

PD3

PD2

35 36

PD1

PD0

37 38

GND

39 40

EXP. CON 0

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