
dsPIC30F Flash Programming Specification
DS70102K-page 10
2010 Microchip Technology Inc.
TABLE 5-5:
FOSC CONFIGURATION BITS DESCRIPTION FOR dsPIC30F4011/4012 AND
dsPIC30F5011/5013
Bit Field
Register
Description
FCKSM<1:0>
FOSC
Clock Switching Mode
1x = Clock switching is disabled, Fail-Safe Clock Monitor is disabled
01 = Clock switching is enabled, Fail-Safe Clock Monitor is disabled
00 = Clock switching is enabled, Fail-Safe Clock Monitor is enabled
FOS<1:0>
FOSC
Oscillator Source Selection on POR
FPR<3:0>
FOSC
Primary Oscillator Mode
1111 = ECIO w/PLL 16X – External Clock mode with 16X PLL. OSC2 pin is I/O
1110 = ECIO w/PLL 8X – External Clock mode with 8X PLL. OSC2 pin is I/O
1101 = ECIO w/PLL 4X – External Clock mode with 4X PLL. OSC2 pin is I/O
1100 = ECIO – External Clock mode. OSC2 pin is I/O
1011 = EC – External Clock mode. OSC2 pin is system clock output (FOSC/4)
1010 = FRC w/PLL 8x – Internal fast RC oscillator with 8x PLL. OSC2 pin is I/O
1001 = ERC – External RC Oscillator mode. OSC2 pin is system clock output
(FOSC/4)
1000 = ERCIO – External RC Oscillator mode. OSC2 pin is I/O
0111 = XT w/PLL 16X – XT Crystal Oscillator mode with 16X PLL
0110 = XT w/PLL 8X – XT Crystal Oscillator mode with 8X PLL
0101 = XT w/PLL 4X – XT Crystal Oscillator mode with 4X PLL
0100 =XT – XT Crystal Oscillator mode (4 MHz-10 MHz crystal)
0011 = FRC w/PLL 16x – Internal fast RC oscillator with 16x PLL. OSC2 pin is I/O
0010 =HS – HS Crystal Oscillator mode (10 MHz-25 MHz crystal)
0001 = FRC w/PLL 4x – Internal fast RC oscillator with 4x PLL. OSC2 pin is I/O
0000 =XTL – XTL Crystal Oscillator mode (200 kHz-4 MHz crystal)
11 = Primary Oscillator
10 = Internal Low-Power RC Oscillator
01 = Internal Fast RC Oscillator
00 = Low-Power 32 kHz Oscillator (Timer1 Oscillator)