8/3/2019 ISP_AVR

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ATMEL AVR ISP Dongle Monday, September 11, 2000

http://www.beyondlogic.org

 Atmel AVR In System Programming Dongle

Atmel offers a software package called the AtmelAVR ISP which allows the programming of AVRMicrocontrollers in circuit with a simple dongle whichis attached to the Parallel Port. This dongle isdetailed below. It can be built cheaply, making it anideal starting point for developing with ATMEL AVRmicros.

The current release of the software is Version 2.65which can be downloaded atftp://www.atmel.com/pub/atmel/avr_isp.zip (875KB)

If you are seeking a Serial/RS232 Version, have alook at Atmel’s Application Note AVR910 whichdetails a serial programmer using at AT90S1200.

2

3

4

5

18

6

19

7

20

8

21

9

22

10

23

11

24

12

25

J1

Parallel Port

1A12

1A24

1A36

1A48

2A111

2A213

2A315

2A417

1Y118

1Y216

1Y314

1Y412

2Y19

2Y27

2Y35

2Y43

1G1

2G19

     V     C     C

     2     0

     G     N     D

     1     0

U1 74HC244

1 2

3 4

5 6

7 8

9 10

J2

ISP

VCC

C1

0.1uF

VCC

MOSI VDD

GND

GND

GND

GND

LED

RST

SCK

MISO

VCC

DATA3

DATA2

DATA4

DATA5

DATA6

DATA7

R1

100K

VCC

Figure 1 : Schematic for the ATMEL ISP Value Added Dongle

Using a 74HC244 Tri-State buffer as the maincomponent, operation is extremely simple. The twoloopback connections, pin 2 to 12 and 3 and 11 isused to identify the dongle. With both links in placethe dongle is identified as a Value Added PackDongle. With only pins 2 and 12 links, it is reportedas a STK300 or AVR ISP Dongle. With only 3 and 11the dongle is reported as an STK200 or old KandaISP Dongle.

DATA2 and DATA3 of the Parallel Port Drive theTriState Outputs. A low will allow the passing of theserial clock and data during programming. MOSI,

LED, SCK and Reset being outputs are buffered fromthe Parallel Port’s DATA5, DATA6, DATA4 andDATA7 Respectively. The only input, MISO is fed intonACK, a status input of the Parallel Port.

There are two standard ISP Connectors for AtmelAVR Microcontroller ISP Programming. One standardis the 10 pin version using a DIL 5x5 header of 0.1”Pitch, shown in the above schematic. This is used onthe ATMEL STK Kits. The other is a more compact 6pin version, once again using a DIL 3x3 header of0.1” pitch. This 6 pin version is the standardconnector for ATMEL ISP Programmers.

The main advantage of the 10 pin header is the cleanand easy use of 10 pin IDC crimp headers.

Name Function DescriptionMOSI Master Out - Slave

InData being transmitted to thepart being programmed is senton this pin

LED Program LED Optional Programming LED

RST Target MCU Reset Connects to Target AVR.Target AVR is programmedwhile in Reset State.

SCK Shift Clock Serial Clock Generated by theProgrammer

MISO Master In – SlaveOut

Data received from the partbeing programmed is sent onthis pin

VCC ISP Power Power Supply for the ISP. ISPHeader must supply power to

the dongle.GND Ground Common Ground

6 Pin Header 10 Pin Header

1 2

3 4

5 6

VDD

GND

MOSI

RS

SCK MISO

1 2

3 4

5 6

7 8

9 10

VDD

GND

GND

GND

GND

MOSI

LED

RST

SCK

MISO

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