dsPIC33FJ32MC204 Microchip Technology, dsPIC33FJ32MC204 Datasheet - Page 99
dsPIC33FJ32MC204
Manufacturer Part Number
dsPIC33FJ32MC204
Description
(dsPIC33FJ16MC304 / dsPIC33FJ32MC20x) 16-bit Microcontrollers
Manufacturer
Microchip Technology
Datasheet
1.DSPIC33FJ32MC204.pdf
(292 pages)
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For example, suppose a 10 MHz crystal is being used
with the selected oscillator mode of XT with PLL.
• If PLLPRE<4:0> = 0, then N1 = 2. This yields a
• If PLLDIV<8:0> = 0x1E, then
• If PLLPOST<1:0> = 0, then N2 = 2. This provides
FIGURE 7-2:
TABLE 7-1:
© 2007 Microchip Technology Inc.
Fast RC Oscillator with Divide-by-N
(FRCDIVN)
Fast RC Oscillator with Divide-by-16
(FRCDIV16)
Low-Power RC Oscillator (LPRC)
Secondary (Timer1) Oscillator (SOSC)
Primary Oscillator (HS) with PLL
(HSPLL)
Primary Oscillator (XT) with PLL
(XTPLL)
Primary Oscillator (EC) with PLL
(ECPLL)
Primary Oscillator (HS)
Primary Oscillator (XT)
Primary Oscillator (EC)
Fast RC Oscillator with PLL (FRCPLL)
Fast RC Oscillator (FRC)
Note 1:
Source (Crystal, External Clock
or Internal RC)
VCO input of 10/2 = 5 MHz, which is within the
acceptable range of 0.8-8 MHz.
M = 32. This yields a VCO output of 5 x 32 = 160
MHz, which is within the 100-200 MHz ranged
needed.
a Fosc of 160/2 = 80 MHz. The resultant device
operating speed is 80/2 = 40 MIPS.
2:
Oscillator Mode
OSC2 pin function is determined by the OSCIOFNC Configuration bit.
This is the default oscillator mode for an unprogrammed (erased) device.
CONFIGURATION BIT VALUES FOR CLOCK SELECTION
dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304 PLL BLOCK DIAGRAM
Divide by
PLLPRE
2-33
Oscillator Source
0.8-8.0 MHz
Secondary
Primary
Primary
Primary
Primary
Primary
Primary
Internal
Internal
Internal
Internal
Internal
Here
Preliminary
X
EQUATION 7-3:
POSCMD<1:0>
Divide by
PLLDIV
F
2-513
VCO
CY
=
xx
xx
xx
xx
10
01
00
10
01
00
xx
xx
100-200 MHz
F
OSC
2
Here
=
1
2
(
PLLPOST
XT WITH PLL MODE
EXAMPLE
Divide by
10000000 * 32
2, 4, 8
FNOSC<2:0>
2 * 2
111
110
101
100
011
011
011
010
010
010
001
000
12.5-80 MHz
DS70283B-page 97
)
Here
=
40 MIPS
Note
F
1, 2
1
1
1
1
1
1
1
OSC
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