參數(shù)資料
型號: PIC17LC766T-08/L
廠商: Microchip Technology
文件頁數(shù): 41/159頁
文件大?。?/td> 0K
描述: IC MCU OTP 16KX16 A/D PWM 84PLCC
標準包裝: 300
系列: PIC® 17C
核心處理器: PIC
芯體尺寸: 8-位
速度: 8MHz
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 66
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: OTP
RAM 容量: 902 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 16x10b
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 84-LCC(J 形引線)
包裝: 帶卷 (TR)
2000 Microchip Technology Inc.
DS30289B-page 19
PIC17C7XX
4.1.4
EXTERNAL CLOCK OSCILLATOR
In the EC oscillator mode, the OSC1 input can be
driven by CMOS drivers. In this mode, the OSC1/
CLKIN pin is hi-impedance and the OSC2/CLKOUT pin
is the CLKOUT output (4 TOSC).
FIGURE 4-4:
EXTERNAL CLOCK INPUT
OPERATION (EC OSC
CONFIGURATION)
4.1.5
EXTERNAL CRYSTAL OSCILLATOR
CIRCUIT
Either a prepackaged oscillator can be used, or a sim-
ple oscillator circuit with TTL gates can be built. Pre-
packaged oscillators provide a wide operating range
and better stability. A well designed crystal oscillator
will provide good performance with TTL gates. Two
types of crystal oscillator circuits can be used: one with
series resonance, or one with parallel resonance.
Figure 4-5 shows implementation of a parallel resonant
oscillator circuit. The circuit is designed to use the fun-
damental frequency of the crystal. The 74AS04 inverter
performs the 180-degree phase shift that a parallel
oscillator requires. The 4.7 k
resistor provides the
negative feedback for stability. The 10 k
potentiome-
ter biases the 74AS04 in the linear region. This could
be used for external oscillator designs.
FIGURE 4-5:
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
Figure 4-6 shows a series resonant oscillator circuit.
This circuit is also designed to use the fundamental fre-
quency of the crystal. The inverter performs a 180-
degree phase shift in a series resonant oscillator cir-
cuit. The 330
resistors provide the negative feedback
to bias the inverters in their linear region.
FIGURE 4-6:
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
Clock from
ext. system
OSC1
OSC2
PIC17CXXX
CLKOUT
(FOSC/4)
20 pF
+5V
20 pF
10 k
4.7 k
10 k
74AS04
XTAL
10k
74AS04
PIC17CXXX
OSC1
To Other
Devices
330
74AS04
PIC17CXXX
OSC1
To Other
Devices
XTAL
330
74AS04
0.1
F
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