User manual

Atmel AT02667: XMEGA-E5 Xplained Hardware User’s Guide [APPLICATION NOTE]

42084A−AVR−04/2013

Peripherals

4.1

Mechanical buttons

Two mechanical buttons are connected to Atmel AVR XMEGA. All buttons have no external pull-ups so user has to

activate internal pull-ups in order to use them. When a button is pressed it will drive the I/O line to GND.

Table 4-1. Mechanical button connection.

Pin on XMEGA Silkscreen text on PCB

PD0 SW0

PD2 SW1

4.2

LEDs

There are two yellow LEDs available on the board that can be turned on and off. The LEDs can be activated by driving

the connected I/O line to GND.

Table 4-2. LED connections.

Pin on XMEGA LED

PD4 Yellow LED0

PD5 Yellow LED1

One green LED (power indicator) and one red LED (status) are also present inside the same package and therefore the

colors can be mixed to orange when both are activated. Those two LEDs are controlled via the Board Controller and

user has no access to them.

4.3

Quadrature encoder

The Quadrature Encoder (SW102) is made of one mechanical button and two outputs. These outputs are connected to

a mechanical switch (SW103) which enables to either connect them to the XMEGA pins or let them accessible on J3

header.

Table 4-3. Quadrature encoder connections.

Pin on XMEGA Pin on J3 header Switch SW103 Quadrature Encoder pins

PA5 NA NA 5 (button)

PA6 NA 2-1 (switch pushed down) 1 (channel A)

PA7 NA 5-4 (switch pushed down) 3 (channel B)

NA PIN3 2-3 (switch pushed up) 1 (channel A)

NA PIN4 5-6 (switch pushed up) 3 (channel B)

4.4

OLED display

The OLED display on the XMEGA-E5 Xplained board is UG-2832HSWEG04 manufactured by WiseChip

Semiconductor Inc. It has a resolution of 128 × 32 pixels. In the design the display is connected via a SPI based

interface. Detailed information about the display can be obtained from the display datasheet.

The connection between the MCU and the OLED display is shown in Table 4-4.