參數(shù)資料
型號: AT32UC3C064C-ALUT
廠商: Atmel
文件頁數(shù): 55/110頁
文件大小: 0K
描述: IC MCU AVR32 64K FLASH 144LQFP
產品培訓模塊: AVR® UC3 Introduction
標準包裝: 300
系列: AVR®32 UC3 C
核心處理器: AVR
芯體尺寸: 32-位
速度: 66MHz
連通性: CAN,EBI/EMI,以太網,I²C,IrDA,LIN,SPI,UART/USART,USB
外圍設備: 欠壓檢測/復位,DMA,I²S,POR,PWM,WDT
輸入/輸出數(shù): 123
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
RAM 容量: 16K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據轉換器: A/D 16x12b,D/A 4x12b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 144-LQFP
包裝: 托盤
49
32117DS–AVR-01/12
AT32UC3C
6.2
Startup Considerations
This chapter summarizes the boot sequence of the AT32UC3C. The behavior after power-up is
controlled by the Power Manager. For specific details, refer to the Power Manager chapter.
6.2.1
Starting of clocks
At power-up, the BOD33 and the BOD18 are enabled. The device will be held in a reset state by
the power-up circuitry, until the VDDIN_33 (resp. VDDCORE) has reached the reset threshold of
the BOD33 (resp BOD18). Refer to the Electrical Characteristics for the BOD thresholds. Once
the power has stabilized, the device will use the System RC Oscillator (RCSYS, 115KHz typical
frequency) as clock source. The BOD18 and BOD33 are kept enabled or are disabled according
to the fuse settings (See the Fuse Setting section in the Flash Controller chapter).
On system start-up, the PLLs are disabled. All clocks to all modules are running. No clocks have
a divided frequency, all parts of the system receive a clock with the same frequency as the inter-
nal RC Oscillator.
6.2.2
Fetching of initial instructions
After reset has been released, the AVR32UC CPU starts fetching instructions from the reset
address, which is 0x8000_0000. This address points to the first address in the internal Flash.
The internal Flash uses VDDIO voltage during read and write operations. It is recommended to
use the BOD33 to monitor this voltage and make sure the VDDIO is above the minimum level
(3.0V).
The code read from the internal Flash is free to configure the system to use for example the
PLLs, to divide the frequency of the clock routed to some of the peripherals, and to gate the
clocks to unused peripherals.
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