ATAVRXPLAIN Datasheet ATAVRXPLAIN | P4-P6

Atmel AVR1924

8370C-AVR-12/11

4 Connectors

The Atmel XMEGA-A1 Xplained kit has five 10-pin, 100mil headers. One header is

used for programming the Atmel ATxmega128A1, and the others are used to access

spare analog and digital pins on the XMEGA (expansion headers).

4.1 Programming headers

The XMEGA can be programmed and debugged by connecting an external

programming/debugging tool to the JTAG and PDI header (J201). The header has a

standard JTAG programmer pin-out (refer to online help in the Atmel AVR Studio),

and tools like the JTAGICE mkII or AVR ONE! can thus be connected directly to the

header. If it is desired to use PDI programming/debugging, an adapter must be used.

Due to physical differences of the JTAGICE mkII and AVR ONE! probes, the PCB has

an opening below the JTAG and PDI header. This is to make room for the orientation

tap on the JTAGICE mkII probe.

Because JTAG TDO and PDI DATA are connected on the PCB for this kit, JTAG

must be disabled on the device in order to use PDI. The reason for this is that when

JTAG is enabled it will enable a pull-up internally on TDO which interferes with the

PDI initialization sequence.

The connection of JTAG_TDO with PDI_DATA is also an issue when the application

on the device uses the JTAG_TDO pin e.g. by driving this pin actively or by using a

pull-up. This will interfere with ongoing PDI communication. Additionally, when JTAG

is disabled and the application is driving the JTAG_TDO pin it might even be not

possible to establish a PDI connection. A workaround for this is to add a ~1k resistor

from PDI_CLK/RESET to GND. This will keep the device in reset while PDI is

enabled. When a PDI connection is established the flash can be erased or JTAG can

be enabled in order to "unlock" the kit.

Table 4-1. XMEGA programming and debugging interface – JTAG and PDI.

J201 pin JTAG

(1)

PDI

(2)

1 TCK -

2 GND GND

(3)

3 TDO DATA

4 VCC VCC

(3)

5 TMS -

6 nSRST CLK

7 - -

8 - -

9 TDI -

10 GND GND

(3)

Notes: 1. Standard pin-out for JTAGICE mkII and other Atmel programming tools.

2. Requires adapter to connect a JTAGICE mkII (refer to AVR Studio help).

3. It is only required to connect on VCC/GND pin.

The Atmel AT32UC3B1256 can be programmed through its boot loader. The boot

loader is evoked by shorting the J600 jumper before applying power to the board. The

Atmel AVR1924

8370C-AVR-12/11

programming is performed through the FLIP plug-in in AVR Studio (which can also be

started as a standalone application).

FLIP (Flexible In-system Programmer) is free Atmel proprietary software that runs on

Windows

9x/Me/NT/2000/XP and Linux

x86. FLIP supports in-system programming

of flash devices through RS232, USB, or CAN.

Alternatively, the AT32UC3B1256 can be programmed by connecting a programming

tool, such as JTAGICE mkII, to test points TP600-607.

NOTE It is not recommended to program the AT32UC3B1256 using a programming tool, as

this will erase the boot loader.

4.2 I/O expansion headers

The XMEGA analog PORTA is available on the J2 header. This allows the user to

connect external signals to the analog-to-digital converter (ADC), digital-to-analog

converter (DAC), and analog comparators on PORTA.

The XMEGA digital PORTF and PORTC are available on the J1 and J4 headers,

respectively. These ports feature general-purpose I/O and various communication

modules (USART, SPI, and TWI). PORTD and PORTF are mixed on the J3 header.

NOTE The communication modules on PORTC and PORTF can be interconnected to test

various functions and features: The USART can loop back communication with a

jumper, or communicate between the two USARTs on the port. The native SPI and

the USART in SPI master mode can be connected, and the TWI module can be

enabled in both master and slave modes at the same time to get loop-back behavior.

(Pull-up resistors can be mounted on R101 and R102. These are not mounted from

the factory.)

Atmel AVR1924

8370C-AVR-12/11

5 Attached memories

The Atmel XMEGA-A1 Xplained kit demonstrates how to use the external bus

interface (EBI) module to connect a 4-bit SDRAM. An 8MB SDRAM (16Mb x 4) is

attached in three-port EBI mode (PORTH, PORTK, and PORTJ).

P1-P3 P4-P6 P7-P9 P10-P12 P13-P13

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