參數(shù)資料
型號(hào)： KSZ8895RQI
廠商： Micrel Inc
文件頁數(shù)： 78/119頁
文件大?。?/td> 0K
描述： IC 10/100-T 5 PORT SW 128PQFP
標(biāo)準(zhǔn)包裝： 66
系列： *
2011-2012 Microchip Technology Inc.
Preliminary
DS41579C-page 61
PIC16(L)F1782/3
6.2.1.4
4x PLL
The oscillator module contains a 4x PLL that can be
used with both external and internal clock sources to
provide a system clock source. The input frequency for
the 4x PLL must fall within specifications. See the PLL
Clock
Timing
Specifications
in
The 4x PLL may be enabled for use by one of two
methods:
1.
Program the PLLEN bit in Configuration Words
to a ‘1’.
2.
Write the SPLLEN bit in the OSCCON register to
a ‘1’. If the PLLEN bit in Configuration Words is
programmed to a ‘1’, then the value of SPLLEN
is ignored.
6.2.1.5
TIMER1 Oscillator
The Timer1 Oscillator is a separate crystal oscillator
that is associated with the Timer1 peripheral. It is opti-
mized for timekeeping operations with a 32.768 kHz
crystal connected between the T1OSO and T1OSI
device pins.
The Timer1 Oscillator can be used as an alternate sys-
tem clock source and can be selected during run-time
using clock switching. Refer to Section 6.3 “Clock
Switching” for more information.
FIGURE 6-5:
QUARTZ CRYSTAL
OPERATION (TIMER1
OSCILLATOR)
C1
C2
32.768 kHz
T1OSI
To Internal
Logic
PIC MCU
Crystal
T1OSO
Quartz
Note 1: Quartz
crystal
characteristics
vary
according
to
type,
package
and
manufacturer. The user should consult the
manufacturer data sheets for specifications
and recommended application.
2: Always verify oscillator performance over
the VDD and temperature range that is
expected for the application.
3: For oscillator design assistance, reference
the following Microchip Applications Notes:
AN826, “Crystal Oscillator Basics and
Crystal Selection for rfPIC and PIC
Devices” (DS00826)
AN849, “Basic PIC Oscillator Design”
(DS00849)
AN943, “Practical PIC Oscillator
Analysis and Design” (DS00943)
AN949, “Making Your Oscillator Work”
(DS00949)
TB097, “Interfacing a Micro Crystal
MS1V-T1K 32.768 kHz Tuning Fork
Crystal to a PIC16F690/SS” (DS91097)
AN1288, “Design Practices for
Low-Power External Oscillators”
(DS01288)
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