參數(shù)資料
型號: ATSAM3A4CA-CU
廠商: Atmel
文件頁數(shù): 33/71頁
文件大?。?/td> 0K
描述: IC MCU 2X128KB CORTEX-M3 100-BGA
標準包裝: 260
系列: SAM3A
核心處理器: ARM? Cortex?-M3
芯體尺寸: 32-位
速度: 84MHz
連通性: CAN,I²C,IrDA,LIN,MMC,SPI,SSC,UART/USART,USB
外圍設備: 欠壓檢測/復位,DMA,I²S,POR,PWM,WDT
輸入/輸出數(shù): 63
程序存儲器容量: 256KB(256K x 8)
程序存儲器類型: 閃存
RAM 容量: 64K x 8
電壓 - 電源 (Vcc/Vdd): 1.62 V ~ 1.95 V
數(shù)據(jù)轉換器: A/D 16x12b,D/A 2x12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 100-TFBGA
包裝: 托盤
41
11057BS–ATARM–13-Jul-12
SAM3X/A
41
11057BS–ATARM–13-Jul-12
SAM3X/A
The SAM-BA Boot is in ROM and is mapped in Flash at address 0x0 when GPNVM bit 1 is set
to 0.
9.1.3.10
GPNVM Bits
The SAM3X/A series features three GPNVM bits that can be cleared or set respectively through
the “Clear GPNVM Bit” and “Set GPNVM Bit” commands of the EEFC0 User Interface.
9.1.4
Boot Strategies
The system always boots at address 0x0. To ensure maximum boot possibilities, the memory
layout can be changed via GPNVM.
A general-purpose NVM (GPNVM1) bit is used to boot either on the ROM (default) or from the
Flash.
The GPNVM bit can be cleared or set respectively through the "Clear General-purpose NVM Bit"
and "Set General-purpose NVM Bit" commands of the EEFC User Interface.
Setting GPNVM Bit 1 selects the boot from the Flash, clearing it selects the boot from the ROM.
Asserting ERASE clears GPNVM Bit 1 and thus selects the boot from the ROM by default.
GPNVM2 enables to select if Flash 0 or Flash 1 is used for the boot.
Setting GPNVM bit 2 selects the boot from Flash 1, clearing it selects the boot from Flash 0.
Table 9-3.
General Purpose Non-volatile Memory Bits
GPNVMBit[#]
Function
0
Security bit
1
Boot mode selection
2
Flash selection (Flash 0 or Flash 1)
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