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| 型號： | EA-EDU-009 |
| 廠商： | Embedded Artists |
| 文件頁數(shù)： | 29/37頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EDUCATION LPC2103 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | MCU |
| 適用于相關(guān)產(chǎn)品： | LPC2103 |
| 所含物品： | 板 |
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2010 Microchip Technology Inc.
DS39770C-page 35
PIC18F85J90 FAMILY
3.0
OSCILLATOR
CONFIGURATIONS
3.1
Oscillator Types
The PIC18F85J90 family of devices can be operated in
six different oscillator modes:
1.
HS
High-Speed Crystal/Resonator
2.
HSPLL High-Speed Crystal/Resonator
with Software PLL Control
3.
EC
External Clock with FOSC/4 Output
4.
ECPLL External Clock with Software PLL
Control
5.
INTOSC Internal Fast RC (8 MHz) oscillator
6.
INTRC Internal 31 kHz Oscillator
Five of these are selected by the user by programming
the FOSC<2:0> Configuration bits. The sixth mode
(INTRC) may be invoked under software control; it can
also be configured as the default mode on device
Resets.
In addition, PIC18F85J90 family devices can switch
between different clock sources, either under software
control, or automatically under certain conditions. This
allows for additional power savings by managing
device clock speed in real time without resetting the
application.
The clock sources for the PIC18F85J90 family of
devices are shown in Figure 3-1.
FIGURE 3-1:
PIC18F85J90 FAMILY CLOCK DIAGRAM
PIC18F85J90 Family
4 x PLL
FOSC<2:0>
Secondary Oscillator
T1OSCEN
Enable
Oscillator
T1OSO
T1OSI
Clock Source Option
for other modules
OSC1
OSC2
Sleep
HSPLL, ECPLL
HS, EC
T1OSC
CPU
Peripherals
IDLEN
P
os
tsca
le
r
MU
X
MU
X
8 MHz
4 MHz
2 MHz
1 MHz
500 kHz
125 kHz
250 kHz
OSCCON<6:4>
111
110
101
100
011
010
001
000
31 kHz
INTRC
Source
Internal
Oscillator
Block
WDT, PWRT, FSCM
8 MHz
Internal Oscillator
(INTOSC)
OSCCON<6:4>
Clock
Control
OSCCON<1:0>
Source
8 MHz
31 kHz (INTRC)
0
1
OSCTUNE<7>
and Two-Speed Start-up
Primary Oscillator
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| EA-EDU-010 | 功能描述:開發(fā)板和工具包 - ARM LPC2138 EDUCATION BRD RoHS:否 制造商:Arduino 產(chǎn)品:Development Boards 工具用于評估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口類型:DAC, ICSP, JTAG, UART, USB 工作電源電壓:3.3 V |
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