PIC32MX440F256H-80I Datasheet, PDF (56/646 Pages) Microchip Technology – 64/100-Pin General Purpose and USB 32-Bit Flash Microcontrollers

PIC32MX3XX/4XX
Figure 4-1: PIC32MX3XX/4XX FAMILY CLOCK DIAGRAM
OSCI
OSCO
SOSCO
SOSCI
Primary Oscillator
(POSC)
PBCLK out
available on
OSCO pin
in certain
clock modes
FRC
Oscillator
8 MHz typical
TUN<5:0>
UFIN
div x
PLL x24
div 2
USB Clock (48 MHz)
4 MHz ≤ UFIN ≤ 5 MHz
PLLDIV<2:0>
UFRCEN
UPLLEN
XT, HS, EC
4 MHz ≤ FIN ≤ 5 MHz
XTPLL, HSPLL,
FIN
ECPLL, FRCPLL
div x
PLL
div y
Postscaler ^Peripherals
div x
PBCLK
PLL Input Divider
FPLLIDIV<2:0>
PLL Output Divider
PLLODIV<2:0>
COSC<2:0>
PLL Multiplier
PLLMULT<2:0>
FRC
PBDIV<2:0>
CPU & Select Peripherals
div 16
FRC /16
Postscaler
FRCDIV
LPRC
Oscillator
FRCDIV<2:0>
32 kHz typical
Secondary Oscillator (SOSC)
32.768 kHz
SOSCEN and FSOSCEN
LPRC
SOSC
Clock Control Logic
Fail-Safe
Clock
Monitor
FSCM INT
FSCM Event
NOSC<2:0>
COSC<2:0>
FSCMEN<1:0> ^OSWEN
WDT, PWRT
Timer1, RTCC
DS61143E-page 54
Preliminary
© 2008 Microchip Technology Inc.