參數(shù)資料
型號: PIC18F87J10T-I/PT
廠商: Microchip Technology
文件頁數(shù): 29/44頁
文件大小: 0K
描述: IC PIC MCU FLASH 64KX16 80TQFP
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
PIC18 J Series MCU Overview
標(biāo)準(zhǔn)包裝: 1
系列: PIC® 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 40MHz
連通性: EBI/EMI,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: 128KB(64K x 16)
程序存儲器類型: 閃存
RAM 容量: 3.8K x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 15x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 80-TQFP
包裝: 剪切帶 (CT)
配用: MA180015-ND - MODULE PLUG-IN 18F87J10 FOR HPC
AC162062-ND - HEADER INTRFC MPLAB ICD2 64/80P
AC164328-ND - MODULE SKT FOR 80TQFP
其它名稱: PIC18F87J10T-I/PTCT
2009 Microchip Technology Inc.
DS39663F-page 33
PIC18F87J10 FAMILY
3.4
PLL Frequency Multiplier
A Phase Locked Loop (PLL) circuit is provided as an
option for users who want to use a lower frequency
oscillator circuit, or to clock the device up to its highest
rated frequency from a crystal oscillator. This may be
useful for customers who are concerned with EMI due
to high-frequency crystals, or users who require higher
clock speeds from an internal oscillator. For these
reasons, the HSPLL and ECPLL modes are available.
The HSPLL and ECPLL modes provide the ability to
selectively run the device at 4 times the external oscil-
lating source to produce frequencies up to 40 MHz.
The PLL is enabled by setting the PLLEN bit in the
OSCTUNE register (Register 3-1).
FIGURE 3-4:
PLL BLOCK DIAGRAM
MU
X
VCO
Loop
Filter
OSC2
OSC1
PLL Enable (OSCTUNE)
FIN
FOUT
SYSCLK
Phase
Comparator
HSPLL or ECPLL (CONFIG2L)
÷4
HS or EC
Mode
REGISTER 3-1:
OSCTUNE: PLL CONTROL REGISTER
U-0
R/W-0
U-0
—PLLEN(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
Unimplemented: Read as ‘0’
bit 6
PLLEN: Frequency Multiplier PLL Enable bit(1)
1 = PLL enabled
0 = PLL disabled
bit 5-0
Unimplemented: Read as ‘0’
Note 1:
Available only for ECPLL and HSPLL oscillator configurations; otherwise, this bit is unavailable and read
as ‘0’.
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