dspic33fj128mc706at-i-pt Microchip Technology Inc., dspic33fj128mc706at-i-pt Datasheet - Page 145

• Manufacturer Part Number: dspic33fj128mc706at-i-pt
• Description: High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

9.0
The dsPIC33FJXXXMCX06A/X08A/X10A oscillator
system provides the following:
• Various external and internal oscillator options as
FIGURE 9-1:
© 2009 Microchip Technology Inc.
Note:
clock sources
Note 1: See Figure 9-2 for PLL details.
SOSCO
R
SOSCI
(2)
2: If the Oscillator is used with XT or HS modes, an extended parallel resistor with the value of 1 MΩ must be connected.
OSCILLATOR
CONFIGURATION
OSC1
OSC2
This data sheet summarizes the features of
the dsPIC33FJXXXMCX06A/X08A/X10A
family of devices. However, it is not
intended to be a comprehensive reference
source. To complement the information in
this data sheet, refer to Section 7.
“Oscillator” (DS70186) in the “dsPIC33F
Family Reference Manual”, which is
available from the Microchip web site
(www.microchip.com).
TUN<5:0>
Oscillator
FRC
Primary Oscillator
Secondary Oscillator
POSCMD<1:0>
Oscillator
dsPIC33FJXXXMCX06A/X08A/X10A OSCILLATOR SYSTEM DIAGRAM
LPRC
dsPIC33FJXXXMCX06A/X08A/X10A
LPOSCEN
S1
S3
÷ 16
FRCDIV<2:0>
PLL
Preliminary
(1)
dsPIC33F
ECPLL, FRCPLL
XTPLL, HSPLL,
Clock Fail
S7
• An on-chip PLL to scale the internal operating
• The internal FRC oscillator can also be used with
• Clock switching between various clock sources
• Programmable clock postscaler for system power
• A Fail-Safe Clock Monitor (FSCM) that detects
• A Clock Control register (OSCCON)
• Nonvolatile Configuration bits for main oscillator
A simplified diagram of the oscillator system is shown
in Figure 9-1.
XT, HS, EC
FRCDIV16
FRCDIVN
frequency to the required system clock frequency
the PLL, thereby allowing full-speed operation
without any external clock generation hardware
savings
clock failure and takes fail-safe measures
selection
SOSC
LPRC
FRC
NOSC<2:0>
Clock Switch
S5
S4
S2
S1/S3
S7
S6
S0
÷ 2
FNOSC<2:0>
Reset
DOZE<2:0>
DS70594A-page 143
WDT, PWRT,
Timer1
FSCM
F
F
OSC
F
CY
P