參數(shù)資料
型號: AT91SAM7A3-AU
廠商: Atmel
文件頁數(shù): 14/39頁
文件大小: 0K
描述: IC ARM7 MCU FLASH 256K 100LQFP
產(chǎn)品培訓(xùn)模塊: SAM9 MPU Boot Solutions & Application Deployment
MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 90
系列: AT91SAM
核心處理器: ARM7
芯體尺寸: 16/32-位
速度: 60MHz
連通性: CAN,I²C,MMC,SPI,SSC,UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 62
程序存儲器容量: 256KB(256K x 8)
程序存儲器類型: 閃存
RAM 容量: 32K 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: 100-LQFP
包裝: 托盤
配用: AT91SAM-ICE-ND - EMULATOR FOR AT91 ARM7/ARM9
AT91SAM7A3-EK-ND - KIT EVAL FOR AT91SAM7A3
21
6042DS–ATARM–14-Dec-06
AT91SAM7A3
9.2
Reset Controller
The Reset Controller is based on three power-on reset cells. It gives the status of the last reset,
indicating whether it is a general reset, a wake-up reset, a software reset, a user reset or a
watchdog reset. In addition, it controls the internal resets and the NRST pin output. It shapes a
signal on the NRST line, guaranteeing that the length of the pulse meets any requirement.
9.3
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 9-2.
Clock Generator Block Diagram
9.4
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
– all the peripheral clocks, independently controllable
– four programmable clock outputs
The Master Clock (MCK) is programmable from a few hundred Hz to the maximum operating fre-
quency of the device.
The Processor Clock (PCK) switches off when entering processor idle mode, thereby reducing
power consumption while waiting an interrupt.
Power
Management
Controller
XIN
XOUT
PLLRC
Slow Clock
SLCK
Main Clock
MAINCK
PLL Clock
PLLCK
Control
Status
Embedded
RC
Oscillator
Main
Oscillator
PLL and
Divider
Clock Generator
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