Datasheet

PIC24F04KA201 FAMILY
DS39937B-page 164 Preliminary © 2009 Microchip Technology Inc.
REGISTER 23-2: FOSCSEL: OSCILLATOR SELECTION CONFIGURATION REGISTER
R/P-1 U-0 U-0 U-0 U-0 R/P-1 R/P-1 R/P-1
IESO
— — — — FNOSC2 FNOSC1 FNOSC0
bit 7 bit 0
Legend:
R = Readable bit P = Programmable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7 IESO: Internal External Switchover bit
1 = Internal External Switchover mode enabled (Two-Speed Start-up enabled)
0 = Internal External Switchover mode disabled (Two-Speed Start-up disabled)
bit 6-3 Unimplemented: Read as ‘0’
bit 2-0 FNOSC<2:0>: Oscillator Selection bits
000 = Fast RC oscillator (FRC)
001 = Fast RC oscillator with divide-by-N with PLL module (FRCDIV+PLL)
010 = Primary oscillator (XT, HS, EC)
011 = Primary oscillator with PLL module (HS+PLL, EC+PLL)
100 = Secondary oscillator (SOSC)
101 = Low-Power RC oscillator (LPRC)
110 = 500 kHz Low-Power FRC oscillator with divide-by-N (LPFRCDIV)
111 = 8 MHz FRC oscillator with divide-by-N (FRCDIV)