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)
