參數(shù)資料
型號: ATSAM3N0CA-AU
廠商: Atmel
文件頁數(shù): 21/60頁
文件大?。?/td> 0K
描述: IC MCU 32KB CORTEX-M3 100-LQFP
標(biāo)準(zhǔn)包裝: 90
系列: SAM3N
核心處理器: ARM? Cortex?-M3
芯體尺寸: 32-位
速度: 48MHz
連通性: I²C,IrDA,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,DMA,POR,PWM,WDT
輸入/輸出數(shù): 79
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): 1.62 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 16x10b; D/A 1x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 100-LQFP
包裝: 托盤
28
11011BS–ATARM–22-Feb-12
SAM3N Summary
7.5
Master to Slave Access
All the Masters can normally access all the Slaves. However, some paths do not make sense,
for example allowing access from the Cortex-M3 S Bus to the Internal ROM. Thus, these paths
are forbidden or simply not wired, and shown as “-” in Table 7-3.
7.6
Peripheral DMA Controller
Handles data transfer between peripherals and memories
Low bus arbitration overhead
– One Master Clock cycle needed for a transfer from memory to peripheral
– Two Master Clock cycles needed for a transfer from peripheral to memory
Next Pointer management for reducing interrupt latency requirement
The Peripheral DMA Controller handles transfer requests from the channel according to the fol-
lowing priorities (Low to High priorities):
Table 7-3.
SAM3N Master to Slave Access
Masters
0
1
2
Slaves
Cortex-M3 I/D Bus
Cortex-M3 S Bus
PDC
0
Internal SRAM
-
X
1
Internal ROM
X
-
X
2
Internal Flash
X
-
3
Peripheral Bridge
-
X
Table 7-4.
Peripheral DMA Controller
Instance name
Channel T/R
100 & 64 Pins
48 Pins
TWI0
Transmit
x
UART0
Transmit
x
USART0
Transmit
x
DAC
Transmit
x
N/A
SPI
Transmit
x
TWI0
Receive
x
UART0
Receive
x
USART0
Receive
x
ADC
Receive
x
SPI
Receive
x
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