參數(shù)資料
型號(hào): AT32UC3C0512C-ALZR
廠商: Atmel
文件頁(yè)數(shù): 7/109頁(yè)
文件大?。?/td> 0K
描述: IC MCU AVR32 512K FLASH 144LQFP
產(chǎn)品培訓(xùn)模塊: AVR® UC3 Introduction
標(biāo)準(zhǔn)包裝: 800
系列: AVR®32 UC3 C
核心處理器: AVR
芯體尺寸: 32-位
速度: 50MHz
連通性: CAN,EBI/EMI,以太網(wǎng),I²C,IrDA,LIN,SPI,UART/USART,USB
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,DMA,I²S,POR,PWM,WDT
輸入/輸出數(shù): 123
程序存儲(chǔ)器容量: 512KB(512K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 64K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 16x12b,D/A 4x12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 144-LQFP
包裝: 托盤
104
9166DS–AVR-01/12
AT32UC3C
10.2.12
WDT
1
Clearing the Watchdog Timer (WDT) counter in second half of timeout period will
issue a Watchdog reset
If the WDT counter is cleared in the second half of the timeout period, the WDT will immedi-
ately issue a Watchdog reset.
Fix/Workaround
Use twice as long timeout period as needed and clear the WDT counter within the first half
of the timeout period. If the WDT counter is cleared after the first half of the timeout period,
you will get a Watchdog reset immediately. If the WDT counter is not cleared at all, the time
before the reset will be twice as long as needed.
2
WDT Control Register does not have synchronization feedback
When writing to the Timeout Prescale Select (PSEL), Time Ban Prescale Select (TBAN),
Enable (EN), or WDT Mode (MODE) fieldss of the WDT Control Register (CTRL), a synchro-
nizer is started to propagate the values to the WDT clcok domain. This synchronization
takes a finite amount of time, but only the status of the synchronization of the EN bit is
reflected back to the user. Writing to the synchronized fields during synchronization can lead
to undefined behavior.
Fix/Workaround
-When writing to the affected fields, the user must ensure a wait corresponding to 2 clock
cycles of both the WDT peripheral bus clock and the selected WDT clock source.
-When doing writes that changes the EN bit, the EN bit can be read back until it reflects the
written value.
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