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ISP Header - 10-way JTAG for Atmel ATmega microcontrollers

 
 
 
The 'Atmel 10-way ATmega JTAG' Header is used for both In-System Programming (ISP) and In-System Debugging (ISD) of Atmel ATmega AVR Microcontrollers via their on-chip JTAG port. This method of connection allows an external debugger such as the Atmel 'JTAG-ICE' to control the execution of code running inside the Target Microcontroller. The port also supports high-speed ISP on the Target Device via JTAG. This method of programming is much faster than the SPI programming algorithm and so is very popular for the larger FLASH derivatives of the ATmega family where SPI programming times can be quite lengthy.
 
 

Frequently Asked Questions (FAQ):

 
 
Advantages
AVR JTAG - Further information
Equinox portable / field programmers supporting AVR JTAG:
Equinox production programmers supporting AVR JTAG:
Atmel Tools Compatability
ISP Header Pin-out
Device Support

Advantages
  • Supports In-System Debugging (ISD) via suitable external debugger e.g. Atmel JTAG-ICE
  • Supports high-speed In-System Programming (ISP) via the JTAG port of the Target Microcontroller
  • The same JTAG port can be be used for both ISP and Debugging

AVR JTAG - Further information

Overview Title

For further information about the 'AVR JTAG' programming method, please CLICK HERE

Equinox portable / field programmers supporting AVR JTAG:

The following Equinox portable / field programmers support the Atmel 'AVR JTAG' programming interface:

Portable Programmers
EPSILON5 MKIVFS2009 USBISPJUNOISPQUAD

Click the programmer picture for more information about the selected programmer.

Equinox production programmers supporting AVR JTAG:

This 'Device Library' is compatible with any of the Equinox programmers listed below:

Overview Title

ISPnanoS3ISPnano-GANGISPnanoS3-ATEISPnanoS4-ATE

ISPnano-MUXISPnano-MUX4ISPnano-MUX8

Important notes:

  • The ISPnano Series 3, Series S3 ATE, Series 4 ATE and GANG programmers require a 'Device Library' per programmer channel.
  • The ISPnano-MUX programming systems only require one licnese per programmer.

Atmel Tools Compatability
  • Atmel JTAG-ICE (Equinox programmers use the same pin-out as this ICE)
  • Atmel STK501 AVR FLASH Microcontroller Starter Kit
  • Atmel STK502 AVR FLASH Microcontroller Starter Kit

ISP Header Pin-out

The table below details the pin-out connections of this header

Pin

No

Pin Name

Programmer Input/Output

Connect to Pin on Target Device

Description

1

PROG_TCK




O

TCK

JTAG TCK Test Clock Signal pin

Clock signal from programmer to Target Device JTAG port

2

PROG_GND

P

GROUND

Ground Connection

Common ground connection between Programmer and Target System

3

PROG_TDO

I

TDO

JTAG TDO Test Data Output pin

Data signal from Target device JTAG port to programmer

4

PROG_VCC

P

TARGET_VCC

Target Vcc Connection

- Pins 4 + 7 are physically connected inside the programmer.

- Connects to Vcc rail of Target System.
- Pin referred to as VTref on Atmel JTAG-ICE

5

PROG_TMS

O

TMS

JTAG TMS Test Mode Select pin

Mode Select Signal from programmer to Target Device JTAG port

6

PROG_RESET

O

RESET

Microcontroller RESET control signal

This pin connects to the main RESET pin of the Target Microcontroller. This pin is not strictly needed for JTAG programming, but it can be used to RESET the Target Device before and after programming

7

PROG_VCC

P

TARGET_VCC

Target Vcc Connection

- See pin 4

- Pins 4 + 7 are physically connected inside the programmer

8

N/C

O

N/C

Not Connected

9

PROG_TDI

O

TDI

JTAG TDI Test Data Input pin

Data signal from programmer to Target Device JTAG port

10

PROG_GND

P

GROUND

Ground Connection

Common ground connection between the programmer and Target System

Key

O - Output from programmer to Target Device

I - Input to programmer from Target Device

P - Passive eg. GROUND and power rails

N/C - Not connected

 
 

Device Support (by family)

 
 
This product supports devices from the families listed below:
 
Atmel Corporation:
  • ATmega AVR - FLASH Microcontroller Family

 

Please note:
Not all devices may be supported within a family.
Please see the Detailed Device Support List for a list of all devices which the product supports.

 

For further information about related products, please see the Supported ISP Headers.





 
 
Supported ISP Headers
ISP Header OVERVIEW >>
 
 
Device Support
Device Support List
 
 
Associated Products View All
Cables
Spare 10-way In-System Programming (ISP) Cable for Equinox Programmers (200mm) >>
Spare 6-way In-System Programming (ISP) Cable for Equinox Programmers (200mm) >>

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