ATXMEGA64A3-MU Atmel, ATXMEGA64A3-MU Datasheet - Page 24
ATXMEGA64A3-MU
Manufacturer Part Number
ATXMEGA64A3-MU
Description
8-bit Microcontrollers - MCU 8/16 bit 1.6V-3.6V 64KB + 4KB
Manufacturer
Atmel
Datasheet
1.ATXMEGA64A3-MU.pdf
(134 pages)
Specifications of ATXMEGA64A3-MU
Product Category
8-bit Microcontrollers - MCU
Rohs
yes
Core
AVR
Data Bus Width
8 bit/16 bit
Maximum Clock Frequency
32 MHz
Program Memory Size
64 KB
Data Ram Size
4 KB
On-chip Adc
Yes
Package / Case
QFN EP
Mounting Style
SMD/SMT
A/d Bit Size
12 bit
A/d Channels Available
8
Data Rom Size
2 KB
Interface Type
I2C, SPI, USART
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
50
Number Of Timers
7
Processor Series
ATXMega
Program Memory Type
Flash
Factory Pack Quantity
260
Supply Voltage - Max
3.6 V
Supply Voltage - Min
1.6 V
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12.3.6
13. WDT - Watchdog Timer
13.1
13.2
8068T–AVR–12/10
Features
Overview
Software reset
The MCU can be reset by the CPU writing to a special I/O register through a timed sequence.
•
•
•
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The XMEGA A3 has a Watchdog Timer (WDT). The WDT will run continuously when turned on
and if the Watchdog Timer is not reset within a software configurable time-out period, the micro-
controller will be reset. The Watchdog Reset (WDR) instruction must be run by software to reset
the WDT, and prevent microcontroller reset.
The WDT has a Window mode. In this mode the WDR instruction must be run within a specified
period called a window. Application software can set the minimum and maximum limits for this
window. If the WDR instruction is not executed inside the window limits, the microcontroller will
be reset.
A protection mechanism using a timed write sequence is implemented in order to prevent
unwanted enabling, disabling or change of WDT settings.
For maximum safety, the WDT also has an Always-on mode. This mode is enabled by program-
ming a fuse. In Always-on mode, application software can not disable the WDT.
11 selectable timeout periods, from 8 ms to 8s.
Two operation modes
Runs from the 1 kHz output of the 32 kHz Ultra Low Power oscillator
Configuration lock to prevent unwanted changes
– Standard mode
– Window mode
XMEGA A3
24
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