atxmega128a3-mu ATMEL Corporation, atxmega128a3-mu Datasheet - Page 42

• Manufacturer Part Number: atxmega128a3-mu
• Description: 8/16-bit Xmega Microcontroller
• Manufacturer: ATMEL Corporation

27. Program, Debug and Test Interfaces
27.1
27.2
27.3
27.4
8068A–AVR–02/08
Features
Overview
JTAG interface
PDI - Program and Debug Interface
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The JTAG and PDI are the physical interface to access the programming and debug facilities.
The PDI uses one dedicated pin together with the Reset pin, no general purpose pins are used.
When JTAG is used it makes use of four general purpose pins.
The JTAG physical layer handles the basic low-level serial communication over four I/O lines
named TMS, TCK, TDI, and TDO. It complies to the IEEE Std. 1149.1 for test access port and
boundary scan.
The PDI is an Atmel proprietary protocol for communication between the microcontroller and
Atmel’s development tools.
JTAG Interface (IEEE std. 1149.1 compliant)
PDI - Program and Debug Interface (Atmel proprietary 2-pin interface)
Boundary-scan capabilities according to the IEEE Std. 1149.1 (JTAG)
Access to the OCD system
Programming of Flash, EEPROM, Fuses and Lock Bits
ATxmega A3
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