參數(shù)資料
型號: AT91SAM7S256C-MU-999
廠商: Atmel
文件頁數(shù): 22/50頁
文件大?。?/td> 0K
描述: IC MCU ARM7 256KB FLASH 64-VQFN
產(chǎn)品培訓模塊: MCU Product Line Introduction
標準包裝: 3,500
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,USB
外圍設備: 欠壓檢測/復位,DMA,POR,PWM,WDT
輸入/輸出數(shù): 32
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): 1.65 V ~ 1.95 V
數(shù)據(jù)轉換器: A/D 8x10b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-VFQFN 裸露焊盤
包裝: 帶卷 (TR)
配用: AT91SAM-ICE-ND - EMULATOR FOR AT91 ARM7/ARM9
AT91SAM7S-EK-ND - KIT EVAL FOR ARM AT91SAM7S
其它名稱: AT91SAM7S256-MU-999
AT91SAM7S256-MU-999-ND
29
SAM7S Series [DATASHEET]
6175KS–ATARM–25-Oct-12
9.2
Clock Generator
The Clock Generator embeds one low-power RC Oscillator, one Main Oscillator and one PLL with the following
characteristics:
RC Oscillator ranges between 22 kHz and 42 kHz
Main Oscillator frequency ranges between 3 and 20 MHz
Main Oscillator can be bypassed
PLL output ranges between 80 and 220 MHz
It provides SLCK, MAINCK and PLLCK.
Figure 9-3. Clock Generator Block Diagram
9.3
Power Management Controller
The Power Management Controller uses the Clock Generator outputs to provide:
the Processor Clock PCK
the Master Clock MCK
the USB Clock UDPCK (not present on SAM7S32/16)
all the peripheral clocks, independently controllable
three programmable clock outputs
The Master Clock (MCK) is programmable from a few hundred Hz to the maximum operating frequency of the device.
The Processor Clock (PCK) switches off when entering processor idle mode, thus allowing reduced power consumption
while waiting for an interrupt.
Embedded
RC
Oscillator
Main
Oscillator
PLL and
Divider
Clock Generator
Power
Management
Controller
XIN
XOUT
PLLRC
Slow Clock
SLCK
Main Clock
MAINCK
PLL Clock
PLLCK
Control
Status
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