Mikroelektronika MikroE Development Kits MIKROE-1206 Datenbogen
Produktcode
MIKROE-1206
© 2009-2011 Microchip Technology Inc.
DS61156G-page 125
PIC32MX5XX/6XX/7XX
8.0
OSCILLATOR
CONFIGURATION
CONFIGURATION
The PIC32MX5XX/6XX/7XX oscillator system has the
following modules and features:
• A total of four external and internal oscillator
following modules and features:
• A total of four external and internal oscillator
options as clock sources
• On-Chip PLL with user-selectable input divider,
multiplier and output divider to boost operating
frequency on select internal and external
oscillator sources
frequency on select internal and external
oscillator sources
• On-Chip user-selectable divisor postscaler on
select oscillator sources
• Software-controllable switching between
various clock sources
• A Fail-Safe Clock Monitor (FSCM) that detects
clock failure and permits safe application recovery
or shutdown
or shutdown
• Dedicated On-Chip PLL for USB peripheral
shows the Oscillator module block diagram.
FIGURE 8-1:
PIC32MX5XX/6XX/7XX FAMILY OSCILLATOR BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the PIC32MX5XX/6XX/7XX family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 6. “Oscillator”
(DS61112) in the “PIC32 Family
Reference Manual”, which is available
from the Microchip web site
(
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 6. “Oscillator”
(DS61112) in the “PIC32 Family
Reference Manual”, which is available
from the Microchip web site
(
www.microchip.com/PIC32
).
2: Some registers and associated bits
described in this section may not be
available on all devices. Refer to
available on all devices. Refer to
in
this data sheet for device-specific register
and bit information.
and bit information.
Timer1, RTCC
Clock Control Logic
Fail-Safe
Clock
Monitor
FSCM INT
FSCM Event
COSC<2:0>
NOSC<2:0>
OSWEN
FSCMEN<1:0>
PLL
Secondary Oscillator (S
OSC
)
SOSCEN and FSOSCEN
SOSCO
SOSCI
Primary Oscillator
XTPLL, HSPLL,
XT, HS, EC
CPU and Select Peripherals
Peripherals
FRCDIV<2:0>
WDT, PWRT
8 MHz typical
FRC
31.25 kHz typical
FRC
Oscillator
LPRC
Oscillator
S
OSC
LPRC
FRCDIV
ECPLL, FRCPLL
TUN<5:0>
div 16
Postscaler
FPLLIDIV<2:0>
PBDIV<1:0>
FRC/16
Postscaler
PLL Multiplier
COSC<2:0>
F
IN
div x
div y
PLL Output Divider
PLLODIV<2:0>
PLL Input Divider
div x
32.768 kHz
PLLMULT<2:0>
PBCLK
UF
IN
= 4 MHz
PLL x24
USB Clock (48 MHz)
div 2
UPLLEN
UFRCEN
div x
UPLLIDIV<2:0>
UF
IN
4 MHz
≤ F
IN
≤ 5 MHz
C1
(3)
C2
(3)
XTAL
R
S(1)
Enable
Notes: 1.
A series resistor, R
S
, may be required for AT strip cut crystals.
2.
The internal feedback resistor, R
F
, is typically in the range of 2 to 10 M
Ω.
3.
Refer to Section 6. “Oscillator ” (DS61112) in the “PIC32 Family
Reference Manual” for help in determining the best oscillator components.
Reference Manual” for help in determining the best oscillator components.
4.
The PBCLK out is available on the OSC2 pin in certain clock modes.
OSC2
(4)
OSC1
R
F(2)
To Internal
Logic
Logic
USB PLL
(P
OSC
)
div 2
ADC
SYSCLK