參數(shù)資料
型號： PIC18LF2450T-I/SO
廠商： Microchip Technology
文件頁數(shù)： 64/143頁
文件大小： 0K
描述： IC PIC MCU FLASH 8KX16 28SOIC
標準包裝： 1,600
系列： PIC® 18F
核心處理器： PIC
芯體尺寸： 8-位
速度： 48MHz
連通性： UART/USART，USB
外圍設備： 欠壓檢測/復位，HLVD，POR，PWM，WDT
輸入/輸出數(shù)： 23
程序存儲器容量： 16KB（8K x 16）
程序存儲器類型： 閃存
RAM 容量： 768 x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 10x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
包裝： 帶卷 (TR)
PIC18F2450/4450
2006 Microchip Technology Inc.
Advance Information
DS39760A-page 25
2.2.2
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
In HS, HSPLL, XT and XTPLL Oscillator modes, a
crystal or ceramic resonator is connected to the OSC1
and OSC2 pins to establish oscillation. Figure 2-2
shows the pin connections.
The oscillator design requires the use of a parallel cut
crystal.
FIGURE 2-2:
CRYSTAL/CERAMIC
RESONATOR OPERATION
(XT, HS OR HSPLL
CONFIGURATION)
TABLE 2-1:
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
TABLE 2-2:
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 CPUDIV Con-
figuration bits. Users may select a clock frequency of
the oscillator frequency, or 1/2, 1/3 or 1/4 of the
frequency.
An external clock may also be used when the micro-
controller is in HS Oscillator mode. In this case, the
OSC2/CLKO pin is left open (Figure 2-3).
Note:
Use of a series cut crystal may give a fre-
quency out of the crystal manufacturer’s
specifications.
Typical Capacitor Values Used:
Mode
Freq
OSC1
OSC2
XT
4.0 MHz
33 pF
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 2-2 for additional
information.
Resonators Used:
4.0 MHz
8.0 MHz
16.0 MHz
Note 1:
See Table 2-1 and Table 2-2 for initial values of
C1 and C2.
2: A series resistor (RS) may be required for AT
strip cut crystals.
3: RF varies with the oscillator mode chosen.
C1(1)
C2(1)
XTAL
OSC2
OSC1
RF
(3)
Sleep
To
Logic
PIC18FXXXX
RS(2)
Internal
Osc Type
Crystal
Freq
Typical Capacitor Values
Tested:
C1
C2
XT
4 MHz
27 pF
HS
4 MHz
27 pF
8 MHz
22 pF
20 MHz
15 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
20 MHz
Note 1: Higher capacitance increases the stability
of oscillator but also increases the start-
up time.
2: When operating below 3V VDD, or when
using certain ceramic resonators at any
voltage, it may be necessary to use the
HS mode or switch to a crystal oscillator.
3: Since each resonator/crystal has its own
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate
values
of
external
components.
4: Rs may be required to avoid overdriving
crystals with low drive level specification.
5: Always verify oscillator performance over
the VDD and temperature range that is
expected for the application.
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PIC18LF2455-I/SO 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC18LF2455-I/SP 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC18LF2455-I/SP 制造商:Microchip Technology Inc 功能描述:8 Bit Microcontroller Clock Speed:48MHz
PIC18LF2455T-I/SO 功能描述:8位微控制器 -MCU 24kBF 2048RM FSUSB2 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
PIC18LF2458-I/SO 功能描述:8位微控制器 -MCU 24KB Flash 2KB RAM RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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