User manual

Atmel-ICE [USER GUIDE]
42330A-MCU-07/2014
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● Unlimited number of user program breakpoints (using BREAK)
● Real-time program counter branch tracing, data trace, process trace (not supported by Atmel-ICE)
For special considerations regarding this debug interface, see “Atmel AVR UC3 OCD” on page 35.
For more information regarding the UC3 OCD system, consult the AVR32UC Technical Reference Manuals,
located on www.atmel.com/uc3
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4.3.2 Atmel AVR XMEGA OCD (JTAG and PDI Physical)
The Atmel AVR XMEGA OCD is otherwise known as PDI (Program and Debug Interface). Two physical
interfaces (JTAG and PDI physical) provide access to the same OCD implementation within the device. It
supports the following features:
● Complete program flow control
● One dedicated program address comparator or symbolic breakpoint (reserved)
● Four hardware comparators
● Unlimited number of user program breakpoints (using BREAK)
● No limitation on system clock frequency
For special considerations regarding this debug interface, see “Special Considerations” on page 32.
4.3.3 Atmel megaAVR OCD (JTAG)
The Atmel megaAVR OCD is based on the JTAG physical interface. It supports the following features:
● Complete program flow control
● Four program memory (hardware) breakpoints (one is reserved)
● Hardware breakpoints can be combined to form data breakpoints
● Unlimited number of program breakpoints (using BREAK) (except ATmega128[A])
For special considerations regarding this debug interface, see “Atmel megaAVR OCD (JTAG)” on page 33.
4.3.4 Atmel megaAVR / tinyAVR OCD (debugWIRE)
The debugWIRE OCD is a specialised OCD module with a limited feature set specially designed for Atmel AVR
devices with low pin-count. It supports the following features:
● Complete program flow control
● Unlimited Number of User Program Breakpoints (using BREAK)
● Automatic baud configuration based on target clock
For special considerations regarding this debug interface, see “Atmel megaAVR OCD (JTAG)” on page 33.
4.3.5 ARM Coresight Components
Atmel ARM Cortex-M based microcontrollers implement Coresight™ compliant OCD components. The features
of these components can vary from device to device. For further information consult the device's datasheet.
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http://www.atmel.com/uc3