參數(shù)資料
型號： AT91SAM9XE128-QU
廠商： Atmel
文件頁數(shù)： 88/159頁
文件大?。?/td> 0K
描述： MCU ARM9 128K FLASH 208-PQFP
產(chǎn)品培訓(xùn)模塊： MCU Product Line Introduction
標(biāo)準(zhǔn)包裝： 24
系列： SAM9XE
核心處理器： ARM9
芯體尺寸： 16/32-位
速度： 180MHz
連通性： EBI/EMI，以太網(wǎng)，I²C，MMC，SPI，SSC，UART/USART，USB
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 96
程序存儲(chǔ)器容量： 128KB（128K x 8）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 40K x 8
電壓 - 電源 (Vcc/Vdd)： 1.65 V ~ 1.95 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 4x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 208-MQFP，208-PQFP
包裝： 托盤
配用： AT91SAM9XE-EK-ND - KIT EVAL FOR AT91SAM9XE
AT91SAM-ICE-ND - EMULATOR FOR AT91 ARM7/ARM9
PIC16F5X
DS41213D-page 22
2007 Microchip Technology Inc.
4.3
External Crystal Oscillator Circuit
Either a pre-packaged oscillator or a simple oscillator
circuit with TTL gates can be used as an external
crystal oscillator circuit. Pre-packaged oscillators
provide a wide operating range and better stability. A
well designed crystal oscillator will provide good perfor-
mance with TTL gates. Two types of crystal oscillator
circuits can be used: one with parallel resonance or one
with series resonance.
Figure 4-3 shows an implementation example of a
parallel resonant oscillator circuit. The circuit is
designed to use the fundamental frequency of the
crystal. The 74AS04 inverter performs the 180
° phase
shift that a parallel oscillator requires. The 4.7 k
Ω
resistor provides the negative feedback for stability.
The 10 k
Ω potentiometers bias the 74AS04 in the
linear region. This circuit could be used for external
oscillator designs.
FIGURE 4-3:
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
(USING XT, HS OR LP
OSCILLATOR MODE)
Figure 4-4 shows a series resonant oscillator circuit.
This circuit is also designed to use the fundamental
frequency of the crystal. The inverters perform a 360
°
phase shift in a series resonant oscillator circuit. The
330 k
Ω resistors provide the negative feedback to bias
the inverters in their linear region.
FIGURE 4-4:
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
(USING XT, HS OR LP
OSCILLATOR MODE)
4.4
RC Oscillator
For applications where precise timing is not a require-
ment, the RC oscillator option is available. The
operation and functionality of the RC oscillator is
dependent upon a number of variables. The RC
oscillator frequency is a function of:
Supply voltage
Resistor (REXT) and capacitor (CEXT) values
Operating temperature.
The oscillator frequency will vary from unit to unit due
to normal process parameter variation. The difference
in lead frame capacitance between package types will
also affect the oscillation frequency, especially for low
CEXT values. The user also needs to account for the
tolerance of the external R and C components.
how
the
R/C combination is
connected.
The oscillator frequency, divided by 4, is available on
the OSC2/CLKOUT pin and can be used for test
purposes or to synchronize other logic.
FIGURE 4-5:
RC OSCILLATOR MODE
20 pF
+5V
20 pF
10k
4.7k
10k
74AS04
XTAL
10k
74AS04
PIC16F5X
CLKIN
To Other
Devices
OSC2
Open
330
74AS04
PIC16F5X
CLKIN
To Other
Devices
XTAL
330
74AS04
0.1
μF
OSC2
KK
Open
VDD
REXT
CEXT
VSS
OSC1
Internal
clock
OSC2/CLKOUT
FOSC/4
PIC16F5X
N
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