參數(shù)資料
型號: AT91SAM7S32B-AU
廠商: Atmel
文件頁數(shù): 51/165頁
文件大?。?/td> 0K
描述: IC MCU ARM7 32KB FLASH 48LQFP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 250
系列: SAM7S
核心處理器: ARM7
芯體尺寸: 16/32-位
速度: 55MHz
連通性: I²C,SPI,SSC,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,DMA,POR,PWM,WDT
輸入/輸出數(shù): 21
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
RAM 容量: 8K x 8
電壓 - 電源 (Vcc/Vdd): 1.65 V ~ 1.95 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 48-LQFP
包裝: 托盤
配用: AT91SAM-ICE-ND - EMULATOR FOR AT91 ARM7/ARM9
AT91SAM7S-EK-ND - KIT EVAL FOR ARM AT91SAM7S
144
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
21.3
Device Initialization with USB
Initialization follows the steps described below:
1.
FIQ initialization
1.
Stack setup for ARM supervisor mode
2.
Setup the Embedded Flash Controller
3.
External Clock detection
4.
Main oscillator frequency detection if no external clock detected
5.
Switch Master Clock on Main Oscillator
6.
Copy code into SRAM
7.
C variable initialization
8.
PLL setup: PLL is initialized to generate a 48 MHz clock necessary to use the USB Device
9.
Disable of the Watchdog and enable of the user reset
10. Initialization of the USB Device Port
11. Jump to SAM-BA Boot sequence (see “SAM-BA Boot” on page 145)
21.4
Device Initialization without USB
Initialization follows the steps described below:
1.
FIQ initialization
1.
Stack setup for ARM supervisor mode
2.
Setup the Embedded Flash Controller
3.
External Clock detection
4.
Main oscillator frequency detection if no external clock detected
5.
Switch Master Clock on Main Oscillator
6.
Copy code into SRAM
7.
C variable initialization
8.
PLL setup: PLL is initialized to generate a 48 MHz clock
9.
Disable of the Watchdog and enable of the user reset
10. Jump to SAM-BA Boot sequence (see “SAM-BA Boot” below)
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