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参数资料
型号： PIC18F45J50T-I/ML
厂商： Microchip Technology
文件页数： 90/164页
文件大小： 0K
描述： IC PIC MCU FLASH 32KB 44-QFN
产品培训模块： PIC18 J Series MCU Overview
标准包装： 1,600
系列： PIC® XLP™ 18F
核心处理器： PIC
芯体尺寸： 8-位
速度： 48MHz
连通性： I²C，SPI，UART/USART，USB
外围设备： 欠压检测/复位，DMA，POR，PWM，WDT
输入/输出数： 34
程序存储器容量： 32KB（16K x 16）
程序存储器类型： 闪存
RAM 容量： 3.8K x 8
电压 - 电源 (Vcc/Vdd)： 2.15 V ~ 3.6 V
数据转换器： A/D 13x10b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 44-VQFN 裸露焊盘
包装： 带卷 (TR)
2011 Microchip Technology Inc.
DS39931D-page 37
PIC18F46J50 FAMILY
3.2.2
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
In HS and HSPLL Oscillator modes, a crystal or
ceramic resonator is connected to the OSC1 and
OSC2 pins to establish oscillation. Figure 3-2 displays
the pin connections.
The oscillator design requires the use of a parallel
resonant crystal.
FIGURE 3-2:
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS OR HSPLL
CONFIGURATION)
TABLE 3-2:
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
TABLE 3-3:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
An internal postscaler allows users to select a clock
frequency other than that of the crystal or resonator.
Frequency division is determined by the CPDIV
Configuration bits. Users may select a clock frequency
of the oscillator frequency, or 1/2, 1/3 or 1/6 of the
frequency.
Note:
Use of a series resonant crystal may give a
frequency out of the crystal manufacturer’s
specifications.
Typical Capacitor Values Used:
Mode
Freq
OSC1
OSC2
HS
8.0 MHz
16.0 MHz
27 pF
22 pF
27 pF
22 pF
Capacitor values are for design guidance only.
These capacitors were tested with the resonators
listed below for basic start-up and operation. These
values are not optimized
.
Different capacitor values may be required to produce
acceptable oscillator operation. The user should test
the performance of the oscillator over the expected
VDD and temperature range for the application.
See the notes following Table 3-3 for additional
information.
Resonators Used:
4.0 MHz
8.0 MHz
16.0 MHz
Note
1:
See Table 3-2 and Table 3-3 for initial values
of C1 and C2.
2:
A series resistor (RS) may be required to
avoid overdriving crystals with low drive level
specification.
C1(1)
C2(1)
XTAL
OSC2
OSC1
RF
Sleep
To
Logic
RS(2)
Internal
PIC18F46J50
Osc Type
Crystal
Freq
Typical Capacitor Values
Tested:
C1
C2
HS
4 MHz
27 pF
8 MHz
22 pF
16 MHz
18 pF
Capacitor values are for design guidance only.
These capacitors were tested with the crystals listed
below for basic start-up and operation. These values
are not optimized.
Different capacitor values may be required to produce
acceptable oscillator operation. The user should test
the performance of the oscillator over the expected
VDD and temperature range for the application.
See the notes following this table for additional
information.
Crystals Used:
4 MHz
8 MHz
16 MHz
Note 1:
Higher capacitance not only increases
the stability of the oscillator, but also
increases the start-up time.
2:
Since each resonator/crystal has its own
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate
values
of
external
components.
3:
Rs may be required to avoid overdriving
crystals with a low drive level specification.
4:
Always verify oscillator performance over
the VDD and temperature range that is
expected for the application.
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PIC18F45K20-E/P 功能描述:8位微控制器 -MCU 32KB Flash 1536B RAM 25 I/O 8B RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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