Datasheet

 2011-2012 Microchip Technology Inc. DS70652E-page 127
dsPIC33FJ16(GP/MC)101/102 AND dsPIC33FJ32(GP/MC)101/102/104
8.1.3 PLL CONFIGURATION
The primary oscillator and internal FRC oscillator can
optionally use an on-chip, 4x PLL to obtain higher
speeds of operation.
For example, suppose an 8 MHz crystal is being used
with the selected oscillator mode of MS with PLL. This
provides a F
OSC of 8 MHz * 4 = 32 MHz. The resultant
device operating speed is 32/2 = 16 MIPS.
EQUATION 8-2: MS WITH PLL MODE
EXAMPLE
TABLE 8-1: CONFIGURATION BIT VALUES FOR CLOCK SELECTION
FCY
FOSC
2
-------------
1
2
---
8000000 416 MIPS== =
Oscillator Mode
Oscillator
Source
POSCMD<1:0> FNOSC<2:0>
See
Note
Fast RC Oscillator with Divide-by-n (FRCDIVN) Internal xx 111 1, 2
Fast RC Oscillator with Divide-by-16 (FRCDIV16) Internal xx 110 1
Low-Power RC Oscillator (LPRC) Internal xx 101 1
Secondary (Timer1) Oscillator (SOSC) Secondary xx 100 1
Primary Oscillator (MS) with PLL (MSPLL) Primary 01 011 —
Primary Oscillator (EC) with PLL (ECPLL) Primary 00 011 1
Primary Oscillator (HS) Primary 10 010 —
Primary Oscillator (MS) Primary 01 010 —
Primary Oscillator (EC) Primary 00 010 1
Fast RC Oscillator (FRC) with Divide-by-n and
PLL (FRCPLL)
Internal xx 001 1
Fast RC Oscillator (FRC) Internal xx 000 1
Note 1: OSC2 pin function is determined by the OSCIOFNC Configuration bit.
2: This is the default oscillator mode for an unprogrammed (erased) device.