Datasheet

PIC24FV32KA304 FAMILY
DS39995D-page 116  2011-2013 Microchip Technology Inc.
9.1 CPU Clocking Scheme
The system clock source can be provided by one of
four sources:
• Primary Oscillator (POSC) on the OSCI and OSCO
pins
• Secondary Oscillator (SOSC) on the SOSCI and
SOSCO pins
The PIC24FV32KA304 family devices consist of
two types of secondary oscillator:
- High-Power Secondary Oscillator
- Low-Power Secondary Oscillator
These can be selected by using the SOSCSEL
(FOSC<5>) bit.
• Fast Internal RC (FRC) Oscillator
- 8 MHz FRC Oscillator
- 500 kHz Lower Power FRC Oscillator
• Low-Power Internal RC (LPRC) Oscillator with two
modes:
- High-Power/High Accuracy mode
- Low-Power/Low Accuracy mode
The primary oscillator and 8 MHz FRC sources have the
option of using the internal 4x PLL. The frequency of the
FRC clock source can optionally be reduced by the pro-
grammable clock divider. The selected clock source
generates the processor and peripheral clock sources.
The processor clock source is divided by two to produce
the internal instruction cycle clock, F
CY. In this
document, the instruction cycle clock is also denoted by
FOSC/2. The internal instruction cycle clock, FOSC/2, can
be provided on the OSCO I/O pin for some operating
modes of the primary oscillator.
9.2 Initial Configuration on POR
The oscillator source (and operating mode) that is used
at a device Power-on Reset (POR) event is selected
using Configuration bit settings. The Oscillator Configu-
ration bit settings are located in the Configuration
registers in the program memory (for more information,
see Section 26.1 “Configuration Bits”). The Primary
Oscillator Configuration bits, POSCMD<1:0>
(FOSC<1:0>), and the Initial Oscillator Select Configura-
tion bits, FNOSC<2:0> (FOSCSEL<2:0>), select the
oscillator source that is used at a POR. The FRC Primary
Oscillator with Postscaler (FRCDIV) is the default (unpro-
grammed) selection. The secondary oscillator, or one of
the internal oscillators, may be chosen by programming
these bit locations. The EC mode Frequency Range
Configuration bits, POSCFREQ<1:0> (FOSC<4:3>),
optimize power consumption when running in EC mode.
The default configuration is “frequency range is greater
than 8 MHz”.
The Configuration bits allow users to choose between
the various clock modes, shown in Table 9 - 1.
9.2.1 CLOCK SWITCHING MODE
CONFIGURATION BITS
The FCKSMx Configuration bits (FOSC<7:6>) are
used jointly to configure device clock switching and the
FSCM. Clock switching is enabled only when FCKSM1
is programmed (‘0’). The FSCM is enabled only when
FCKSM<1:0> are both programmed (‘00’).
TABLE 9-1: CONFIGURATION BIT VALUES FOR CLOCK SELECTION
Oscillator Mode Oscillator Source POSCMD<1:0> FNOSC<2:0> Notes
8 MHz FRC Oscillator with Postscaler
(FRCDIV)
Internal 11 111 1, 2
500 kHz FRC Oscillator with Postscaler
(LPFRCDIV)
Internal 11 110 1
Low-Power RC Oscillator (LPRC) Internal 11 101 1
Secondary (Timer1) Oscillator (SOSC) Secondary 00 100 1
Primary Oscillator (HS) with PLL Module
(HSPLL)
Primary 10 011
Primary Oscillator (EC) with PLL Module
(ECPLL)
Primary 00 011
Primary Oscillator (HS) Primary 10 010
Primary Oscillator (XT) Primary 01 010
Primary Oscillator (EC) Primary 00 010
8 MHz FRC Oscillator with PLL Module
(FRCPLL)
Internal 11 001 1
8 MHz FRC Oscillator (FRC) Internal 11 000 1
Note 1: The OSCO pin function is determined by the OSCIOFNC Configuration bit.
2: This is the default oscillator mode for an unprogrammed (erased) device.