Atmel AVR1019 Installation and operating instructions

Atmel AVR1019: Migration from

ATxmega128A1/64A1 to ATxmega1281U/64A1U

Features

• Enhancements and added functions

• Reset sources

• I/O ports

• DAC – digital to analog converter

• AC – analog comparator

1 Introduction

This application note is a guide to assist users of ATxmega128A1/64A1 in

converting designs to Atmel ATxmega128A1U/64A1U. For complete device details,

always refer to the most recent version of the ATxmega128A1U/64A1U datasheet

and the Atmel®AVR®XMEGA®AU manual. Errata differences between

ATxmega128A1/64A1 and ATxmega128A1U/64A1U are not listed in this

document, only in the device datasheet.

In addition to the differences described in this document, other typical

characteristics could be different. Please check the latest datasheet for details.

ATxmega128A1U/64A1U also includes new configuration options and functions. As

far as possible these are implemented as a superset of existing

ATxmega128A1/64A1 functions, so existing code for these devices will work on the

new devices without changing existing configuration or enabling new functions. The

new options and functions are listed in the application note for customers who in

addition to a pure migration also wish to see an overview to consider use of the

new functions.

8-bit Atmel

Microcontrollers

Application Note

Rev. 8415A-AVR-07/11

2 Atmel AVR1019 8415A-AVR-07/11

2 Enhancements and added functions

In this section, we summarize the enhancements or added features in Atmel

ATxmega128A1U/64A1U compared with Atmel ATxmega128A1/64A1. For pure

migration, you can skip the section and start from the next section.

2.1 USB

•One USB 2.0 full speed (12Mbps) and low speed (1.5Mbps) device compliant

interface is added

2.2 Clock system

•A divide-by-two option for the PLL output that enables output frequency down to

10MHz

•PLL lock failure detection with optionally Non-Maskable Interrupt (NMI), for

improved safety and robustness

•Non-prescaled Real Time Counter clock source options: External clock from

TOSC1, 32.768kHz from TOSC, and the 32.768kHz from the 32.768kHz Internal

Oscillator

•The 32MHz Internal Oscillator can be tuned to run at any frequency between

30MHz and 55MHz

2.3 I/O ports

•Alternate pin locations for Timer/Counter 0 Compare Channels, USART0 and SPI

•Alternate pin locations for the Peripheral Clock and Event output functions

2.4 Analog to digital converter

•Automatic input channel scan

•VCC/2 voltage reference option

•1/2x (divide by two) gain stage setting

•Internal ground can be used as negative input in differential mode (with gain)

2.5 Analog comparator

•A constant current source

2.6 CRC16/CRC32 generator

•A CRC16/CRC32 Generator Module that supports CRC16 (RC-CCITT) and CRC-

32 (IEEE 802.3)

2.7 16-bit timer/counter0

•Split mode that enable two 8-bit Timer/Counters with 4PWM channels each

2.8 High resolution extension

•Hi-Res+ option to allow PWM resolution to be increased with 8x (3-bit)

Atmel AVR1019

8415A-AVR-07/11

2.9 Power management

•Possibility to enable sequential start of the components used for analog modules

ADC and Analog Comparator in order to reduce start-up current

4 Atmel AVR1019 8415A-AVR-07/11

3 Reset sources

3.1 Brown-out detection

The programmable BODLEVEL settings are different in Atmel

ATxmega128A1U/64A1U. See Table 3-1 below for details. Please refer to the device

datasheet regarding tolerance for the Brown-out levels.

Table 3-1. Brown-out levels.

BODLEVEL VBOT – XMEGA AU VBOT – XMEGA A

111 1.6V 1.6V

110 1.8V 1.9V

101 2.0V 2.1V

011 2.4V 2.6V

010 2.6V 2.9V

000 3.0V 3.4V

Atmel AVR1019

8415A-AVR-07/11

4 I/O ports

The I/O port pins are LVTTL and LVCMOS compatible for Atmel

ATxmega128A1U/64A1U devices. The minimum “Input High Voltage” is never higher

than 2.0V for VCC > 2.7V.

In Atmel ATxmega128A1/64A1, the minimum “Input High Voltage” is 0.7VCC, and

could be higher than 2.0V for VCC>2.86V.

6 Atmel AVR1019 8415A-AVR-07/11

5 DAC – digital to analog converter

The Atmel ATxmega128A1U/64A1U DAC has two continuous output channels, and

not a sample and hold circuit as Atmel ATxmega128A1/64A1 devices. This gives

continuous time output and higher sample rate for each channel. There is separate

calibration (offset/gain) for each DAC channel in ATxmega128A1U/64A1U.

When DACA0OFFCAL (in Production Signature Row) is written to CH0OFFSETCAL

in DACA, CH1OFFSETCAL is also written with this value. The details of this

operation are shown below.

The first step,

•read DACA0OFFCAL from production signature row

•write DACA0OFFCAL to DACA.CH0OFFSETCAL

This will result in:

•DACA.CH0OFFSETCAL = DACA0OFFCAL

•DACA.CH1OFFSETCAL = DACA0OFFCAL

The second step,

•read DACA1OFFCAL from production signature row

•write DACA1OFFCAL to DACA.CH1OFFSETCAL

This will result in:

•DACA.CH1OFFSETCAL = DACA1OFFCAL

After that, any further writing to DACA.CH0OFFSELCAL does not change

DACA.CH1OFFSELCAL until the next reset. The same is implemented for both

OFFSET and GAIN calibration registers in DACA and DACB. This ensure that

customers using the ATxmega128A1/64A1 DAC can continue and use the same

calibration sequence and still calibrate both channels.

TIMCTRL register does not exist in ATxmega128A1U/64A1U, so there are no timing

constraints on DAC operation.

Atmel AVR1019

8415A-AVR-07/11

6 AC – analog comparator

In Atmel ATxmega128A1U/64A1U, there is a two-cycle delay from writing a new MUX

setting until it takes effect.

8 Atmel AVR1019 8415A-AVR-07/11

7 Registers

7.1 Removed registers and bits

The below table lists register bits, which exist in Atmel ATxmega128A1/64A1 but not

in Atmel ATxmega128A1U/64A1U.

Table 7-1. Register bits and functionality that does not exist in

ATxmega128A1U/64A1U.

FUSEBYTE2 BODACT[1:0](1) BOD functionality when in active mode

CONINTVAL[2:0] DAC Conversion Interval

TIMCTRL REFRESH[3:0] DAC Channel Refresh Timing Control

Note: 1. BODACT fuses are now located in FUSEBYTE5 for all devices.

Atmel AVR1019

8415A-AVR-07/11

8 Table of contents Features...............................................................................................1

1 Introduction......................................................................................1

2 Enhancements and added functions .............................................2

2.1 USB.....................................................................................................................2

2.2 Clock system.......................................................................................................2

2.3 I/O ports...............................................................................................................2

2.4 Analog to digital converter...................................................................................2

2.5 Analog comparator..............................................................................................2

2.6 CRC16/CRC32 generator ...................................................................................2

2.7 16-bit timer/counter0 ...........................................................................................2

2.8 High resolution extension....................................................................................2

2.9 Power management............................................................................................3

3 Reset sources ..................................................................................4

3.1 Brown-out detection ............................................................................................4

4 I/O ports............................................................................................5

5 DAC – digital to analog converter ..................................................6

6 AC – analog comparator..................................................................7

7 Registers...........................................................................................8

7.1 Removed registers and bits.................................................................................8

8 Table of contents .............................................................................9

8415A-AVR-07/11

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