D301 datasheet(333/416 Pages) MICROCHIP

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DS30010118D-page 333

PIC24FJ256GA705 FAMILY

FOSCSEL CONFIGURATION REGISTER

U-1

—

bit 23

bit 16

U-1

r-0

—

bit 15

bit 8

R/PO-1

IESO

PLLMODE3

PLLMODE2

PLLMODE1

PLLMODE0

FNOSC2

FNOSC1

FNOSC0

bit 7

bit 0

Legend:

PO = Program Once bit

r = Reserved bit

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 23-10

Unimplemented: Read as ‘1’

bit 9-8

Reserved: Maintain as ‘0’

bit 7

IESO: Two-Speed Oscillator Start-up Enable bit

1 = Starts up the device with FRC, then automatically switches to the user-selected oscillator when

ready

0 = Starts up the device with the user-selected oscillator source

bit 6-3

PLLMODE<3:0>: Frequency Multiplier Select bits

1111 = No PLL is used (PLLEN bit is unavailable)

1110 = 8x PLL is selected

1101 = 6x PLL is selected

1100 = 4x PLL is selected

0111 = 96 MHz PLL is selected (Input Frequency = 48 MHz)

0110 = 96 MHz PLL is selected (Input Frequency = 32 MHz)

0101 = 96 MHz PLL is selected (Input Frequency = 24 MHz)

0100 = 96 MHz PLL is selected (Input Frequency = 20 MHz)

0011 = 96 MHz PLL is selected (Input Frequency = 16 MHz)

0010 = 96 MHz PLL is selected (Input Frequency = 12 MHz)

0001 = 96 MHz PLL is selected (Input Frequency = 8 MHz)

0000 = 96 MHz PLL is selected (Input Frequency = 4 MHz)

bit 2-0

FNOSC<2:0>: Oscillator Selection bits

111 = Oscillator with Frequency Divider (OSCFDIV)

110 = Reserved

101 = Low-Power RC Oscillator (LPRC)

100 = Secondary Oscillator (SOSC)

011 = Primary Oscillator with PLL (XTPLL, HSPLL, ECPLL)

010 = Primary Oscillator (XT, HS, EC)

001 = Fast RC Oscillator with PLL (FRCPLL)

000 = Fast RC Oscillator (FRC)

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