參數(shù)資料
型號： AQ80C52EXXX-16SHXXX:RD
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
封裝： CERAMIC, QFP-44
文件頁數(shù)： 52/134頁
文件大?。?/td> 3805K
24
8068U–AVR–06/2013
XMEGA A3
Not recommended for new designs -
Use XMEGA A3U series
12.3.6
Software reset
The MCU can be reset by the CPU writing to a special I/O register through a timed sequence.
13. WDT - Watchdog Timer
13.1
Features
11 selectable timeout periods, from 8 ms to 8s.
Two operation modes
– Standard mode
– Window mode
Runs from the 1 kHz output of the 32 kHz Ultra Low Power oscillator
Configuration lock to prevent unwanted changes
13.2
Overview
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.
相關PDF資料
PDF描述
AQ80C52EXXX-20SHXXX:R 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44
AQ80C52EXXX-30:RD 8-BIT, MROM, 30 MHz, MICROCONTROLLER, CQFP44
AQ80C52TXXX-36SHXXX:D 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44
AQ80C52XXX-16SHXXX:D 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
AQ80C52XXX-36SHXXX:D 8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44
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