Microchip PIC24EP128MC206 Handleiding
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PIC24EP128MC206
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© 2009-2012 Microchip Technology Inc. DS70580C-page 7-1
Oscillator
7
Section 7. Oscillator
HIGHLIGHTS
This section of the manual contains the following topics:
7.1 Introduction .................................................................................................................... 7-2
7.2 CPU Clocking................................................................................................................. 7-4
7.3 Oscillator Configuration Registers ................................................................................. 7-5
7.4 Special Function Registers ............................................................................................ 7-8
7.5 Primary Oscillator (POSC)............................................................................................. 7-18
7.6 Internal Fast RC (FRC) Oscillator ................................................................................ 7-22
7.7 Phase-Locked Loop (PLL) ........................................................................................... 7-23
7.8 Low-Power Secondary Oscillator (SOSC)..................................................................... 7-28
7.9 Low-Power RC (LPRC) Oscillator................................................................................ 7-29
7.10 Auxiliary Oscillator .......................................................................................................7-30
7.11 Auxiliary Phase-Locked Loop (APLL) .......................................................................... 7-31
7.12 Fail-Safe Clock Monitor (FSCM) .................................................................................. 7-34
7.13 Clock Switching............................................................................................................7-35
7.14 Two-Speed Start-up ..................................................................................................... 7-39
7.15 Register Maps..............................................................................................................7-40
7.16 Related Application Notes............................................................................................ 7-41
7.17 Revision History ...........................................................................................................7-42
dsPIC33E/PIC24E Family Reference Manual
DS70580C-page 7-2 © 2009-2012 Microchip Technology Inc.
7.1 INTRODUCTION
The dsPIC33E/PIC24E oscillator system includes these characteristics:
• Four external and internal oscillator options
• Auxiliary oscillator that provides clock source to the USB module (not available on all
devices)
• On-chip Phase-Locked Loop (PLL) to boost internal operating frequency on select internal
and external oscillator sources
• On-the-fly clock switching between various clock sources
• Doze mode for system power savings
• Fail-Safe Clock Monitor (FSCM) that detects clock failure and permits safe application
recovery or shutdown
• Nonvolatile Configuration bits for clock source selection
• Scalable Reference Clock Out (REFCLKO) (not available on all devices)
A block diagram of the dsPIC33E/PIC24E oscillator system is shown in Figure 7-1.
Note: This family reference manual section is meant to serve as a complement to device
data sheets. Depending on the device variant, this manual section may not apply
to all dsPIC33E/PIC24E devices.
Please consult the note at the beginning of the “Oscillator” chapter in the current
device data sheet to check whether this document supports the device you are
using.
Device data sheets and family reference manual sections are available for
download from the Microchip Worldwide Web site at: http://www.microchip.com
© 2009-2012 Microchip Technology Inc. DS70580C-page 7-3
Section 7. Oscillator
Oscillator
7
Figure 7-1: Oscillator System Block Diagram
Secondary Oscillator (SOSC)
LPOSCEN
SOSCO
SOSCI
Timer1
XTPLL, HSPLL,
XT, HS, EC
FRCDIV<2:0>
WDT, PWRT,
FRCDIVN
SOSC
FRCDIV16
ECPLL, FRCPLL
NOSC<2:0> FNOSC<2:0>
Reset
FRC
Oscillator
LPRC
Oscillator
DOZE<2:0> (1:1 Default)
S3
S1
S2
S1/S3
S7
S6
FRC
LPRC
S0
S5
S4
÷ 16
Clock Switch
S0
Clock Fail
÷ 2
TUN<5:0>
PLL(1) FCY(3)
FOSC
FRCDIV
DOZE
Note 1: See Figure 7-8 for the source of the FOSC signal.
2: If the oscillator is used with XT or HS modes, an external parallel resistor with the value of 1 MΩ must be connected.
3: The terms Fcy and Fp are used interchangeably throughout this document and are equivalent for the default Doze mode 1:1 ratio.
4: This feature is not available on all devices. Refer to the “Oscillator” chapter in the specific device data sheet for availability.
FSCM
ACLK
POSCCLK
Auxiliary
SELACLK
USB
FOSC(1)
ENAPLL
ASRCSEL
ENAPLL
APLL
POSCCLK
FRCCLK
FOSC(1)
÷ N
APLLPOST<1:0>
FRCCLK
FRCSEL
Oscillator (Aosc)
OSC2
OSC1
Primary Oscillator (POSC)
R(2)
POSCMD<1:0>
FP(3)
(See Note 4)
(See Note 4)
POSCLK
FOSC
÷ N
RODIV<3:0>
ROSEL
REFCLKO
RPn
48 MHz
3.5 MHz ≤ AUX_Fin ≤ 10 MHz
1
0
1
0
1
0
0
1
Product specificaties
| Merk: | Microchip |
| Categorie: | Niet gecategoriseerd |
| Model: | PIC24EP128MC206 |
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