dspic33fj128mc204 Microchip Technology Inc., dspic33fj128mc204 Datasheet - Page 142

• Manufacturer Part Number: dspic33fj128mc204
• Description: High-performance, 16-bit Digital Signal Controllers
• Manufacturer: Microchip Technology Inc.

9.0
The dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/
X04, and dsPIC33FJ128MCX02/X04 oscillator system
provides:
• External and internal oscillator options as clock
FIGURE 9-1:
DS70291C-page 140
SOSCO
SOSCI
Note:
sources
Note 1: See Figure 9-2 for PLL details.
R
(2)
OSCILLATOR CONFIGURATION
2:
OSC1
OSC2
Secondary Oscillator
This data sheet summarizes the features
of
dsPIC33FJ64MCX02/X04,
dsPIC33FJ128MCX02/X04
devices. It is not intended to be a
comprehensive reference source. To com-
plement the information in this data sheet,
refer to the “dsPIC33F Family Reference
Manual”, Section 39. “Oscillator (Part
III)” (DS70216), which is available from
the
chip.com).
If the Oscillator is used with XT or HS modes, an external parallel resistor with the value of 1 MΩ must be connected.
Primary Oscillator
Oscillator
TUN<5:0>
Microchip
the
FRC
POSCMD<1:0>
dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04, AND dsPIC33FJ128MCX02/
X04 OSCILLATOR SYSTEM DIAGRAM
LPOSCEN
Oscillator
LPRC
dsPIC33FJ32MC302/304,
Auxiliary Oscillator
website
POSCCLK
S1
S3
÷ 16
(www.micro-
families
FRCDIV<2:0>
AOSCMD<1:0>
AOSCCLK
and
Preliminary
POSCCLK
of
PLL
ASRCSEL
XTPLL, HSPLL,
ECPLL, FRCPLL
• An on-chip Phase-Locked Loop (PLL) to scale the
• An internal FRC oscillator that can also be used
• 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
• An auxiliary crystal oscillator for audio DAC
A simplified diagram of the oscillator system is shown
in Figure 9-1.
F
VCO
Clock Fail
internal operating frequency to the required
system clock frequency
with the PLL, thereby allowing full-speed
operation without any external clock generation
hardware
savings
clock failure and takes fail-safe measures
selection.
S7
XT, HS, EC
(1)
FRCDIV16
FRCDIVN
SOSC
F
LPRC
FRC
VCO
(1)
SELACK
Clock Switch
NOSC<2:0> FNOSC<2:0>
S1/S3
S7
S0
S5
S4
S2
S6
÷ 2
© 2009 Microchip Technology Inc.
Reset
APSTSCLR<2:0>
DOZE<2:0>
÷ N
ACLK
WDT, PWRT,
Timer1
FSCM
DAC
F
F
F
OSC
CY
P