PIC24EP64MC204-E/PT Microchip Technology, PIC24EP64MC204-E/PT Datasheet - Page 152

• Manufacturer Part Number: PIC24EP64MC204-E/PT
• Description: 16 Bit MCU, 64KB Flash, 8KB RAM, 60 MHz, 44 Pin, MCPWM,QEI, 3 OpAmp, 4 Comp, PTG
• Manufacturer: Microchip Technology

dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X, AND PIC24EPXXXGP/MC20X
9.1
The dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/
50X, and PIC24EPXXXGP/MC20X family of devices
provide seven system clock options:
• Fast RC (FRC) Oscillator
• FRC Oscillator with Phase-Locked Loop (PLL)
• FRC Oscillator with postscaler
• Primary (XT, HS or EC) Oscillator
• Primary Oscillator with PLL
• Low-Power RC (LPRC) Oscillator
FIGURE 9-2:
EQUATION 9-2:
EQUATION 9-3:
DS70657F-page 152
Where,
N1 = PLLPRE + 2
N2 = 2 x (PLLPOST + 1)
M = PLLDIV + 2
Note 1:
F
F
IN
SYS
PLLPRE<4:0>
CPU Clocking System
0.8 MHz < F
=
F
÷ N1
IN
This frequency range must be met at all times.



------ -
N1
M
PLLI
PLL BLOCK DIAGRAM
F
F


OSC
VCO
F
=
F
(1)
OSC
PLLI
F
< 8.0 MHz
IN
CALCULATION
CALCULATION
=



F
------------------------------------ -


IN
PLLPRE
PFD
PLLDIV



-------------------- -
N1 N2
M

+
+
2
2
PLLDIV<8:0>






=
VCO
÷ M
F
120 MH
IN



--------------------------------------------------------------------------------------- -

Z
PLLPRE
F
< F
SYS
Instruction execution speed or device operating
frequency, F
EQUATION 9-1:
Figure 9-2
Equation 9-2
frequency (F
Equation 9-3
frequency (F
SYS
(1)

+
PLLDIV
PLLPOST<1:0>
< 340 MH
2

is a block diagram of the PLL module.

CY
÷ N2
IN
IN
2 PLLPOST

) and output frequency (F
) and VCO frequency (F
provides the relation between input
provides the relation between input
, is given by
+
Z
2
 2011-2012 Microchip Technology Inc.

F
CY
F
DEVICE OPERATING
FREQUENCY
F
F
OSC
OSC
= Fosc/2
OSC
+
Equation
1
 120 MHz @ +125ºC
 140 MHz @ +85ºC



9-1.
SYS
OSC
).
).