PIC24FJ64GA datasheet(204/262 Pages) MICROCHIP

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PIC24FJ64GA004 FAMILY

DS39881C-page 202

Preliminary

CW2: FLASH CONFIGURATION WORD 2

U-1

—

bit 23

bit 16

R/PO-1

U-1

R/PO-1

IESO

—

FNOSC2

FNOSC1

FNOSC0

bit 15

bit 8

R/PO-1

U-1

R/PO-1

FCKSM1

FCKSM0

OSCIOFCN

IOL1WAY

—

I2C1SEL

POSCMD1

POSCMD0

bit 7

bit 0

Legend:

r = Reserved bit

R = Readable bit

PO = Program Once bit

U = Unimplemented bit, read as ‘0’

-n = Value when device is unprogrammed

‘1’ = Bit is set

‘0’ = Bit is cleared

bit 23-16

Unimplemented: Read as ‘1’

bit 15

IESO: Internal External Switchover bit

1 = IESO mode (Two-Speed Start-up) enabled

0 = IESO mode (Two-Speed Start-up) disabled

bit 14-11

Unimplemented: Read as ‘1’

bit 10-8

FNOSC2:FNOSC0: Initial Oscillator Select bits

111 = Fast RC Oscillator with Postscaler (FRCDIV)

110 = Reserved

101 = Low-Power RC Oscillator (LPRC)

100 = Secondary Oscillator (SOSC)

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

010 = Primary Oscillator (XT, HS, EC)

001 = Fast RC Oscillator with postscaler and PLL module (FRCPLL)

000 = Fast RC Oscillator (FRC)

bit 7-6

FCKSM1:FCKSM0: Clock Switching and Fail-Safe Clock Monitor Configuration bits

1x = Clock switching and Fail-Safe Clock Monitor are disabled

01 = Clock switching is enabled, Fail-Safe Clock Monitor is disabled

00 = Clock switching is enabled, Fail-Safe Clock Monitor is enabled

bit 5

OSCIOFCN: OSCO Pin Configuration bit

If POSCMD1:POSCMD0 = 11 or 00:

1 = OSCO/CLKO/RA3 functions as CLKO (FOSC/2)

0 = OSCO/CLKO/RA3 functions as port I/O (RA3)

If POSCMD1:POSCMD0 = 10 or 01:

OSCIOFCN has no effect on OSCO/CLKO/RA3.

bit 4

IOL1WAY: IOLOCK One-Way Set Enable bit

1 = The OSCCON<IOLOCK> bit can be set once, provided the unlock sequence has been completed.

Once set, the Peripheral Pin Select registers cannot be written to a second time.

0 = The OSCCON<IOLOCK> bit can be set and cleared as needed, provided the unlock sequence has

been completed

bit 3

Unimplemented: Read as ‘1’

bit 2

I2C1SEL: I2C1 Pin Select bit

1 = Use default SCL1/SDA1 pins

0 = Use alternate SCL1/SDA1 pins

bit 1-0

POSCMD1:POSCMD0: Primary Oscillator Configuration bits

11 = Primary oscillator disabled

10 = HS Oscillator mode selected

01 = XT Oscillator mode selected

00 = EC Oscillator mode selected

PIC24FJ64GA Datasheet(PDF) 204 Page - Microchip Technology

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