Information

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SPDIP 28 16-Bit 40 null I/O number 21

dsPIC33F/PIC24H PROGRAMMING SPECIFICATION

IESO FOSCSEL Two-Speed Oscillator Start-Up Enable bit

1 = Start-Up device with FRC, then automatically switch to the user-selected

oscillator source when ready

0 = Start-Up device with user-selected oscillator source

FNOSC<2:0> FOSCSEL Initial Oscillator Source Selection bits

111 = Internal Fast RC (FRC) oscillator with postscaler

110 = Internal Fast RC (FRC) oscillator with divide-by-16

101 = LPRC oscillator

100 = Secondary (LP) oscillator

011 = Primary (XT, HS, EC) oscillator with PLL

010 = Primary (XT, HS, EC) oscillator

001 = Internal Fast RC (FRC) oscillator with PLL

000 = FRC oscillator

FCKSM<1:0> FOSC Clock Switching Mode bits

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

IOL1WAY FOSC Peripheral Pin Select Configuration

1 = Allow only one reconfiguration

0 = Allow multiple reconfigurations

OSCIOFNC FOSC OSC2 Pin Function bit (except in XT and HS modes)

1 = OSC2 is clock output

0 = OSC2 is general purpose digital I/O pin

POSCMD<1:0> FOSC Primary Oscillator Mode Select bits

11 = Primary oscillator disabled

10 = HS crystal oscillator mode

01 = XT crystal oscillator mode

00 = EC (external clock) mode

PLLKEN FWDT PLL Lock Enable bit

1 = Clock switch to PLL source waits for valid PLL lock signal

0 = Clock switch to PLL source ignores PLL lock signal

FWDTEN FWDT Watchdog Enable bit

1 = Watchdog always enabled (LPRC oscillator cannot be disabled. Clearing the

SWDTEN bit in the RCON register will have no effect)

0 = Watchdog enabled/disabled by user software (LPRC can be disabled by

clearing the SWDTEN bit in the RCON register)

WINDIS FWDT Watchdog Timer Window Enable bit

1 = Watchdog Timer in Non-Window mode

0 = Watchdog Timer in Window mode

WDTPRE FWDT Watchdog Timer Prescaler bit

1 = 1:128

0 = 1:32

WDTPOST FWDT Watchdog Timer Postscaler bits

1111 = 1:32,768

1110 = 1:16,384

•

0001 = 1:2

0000 = 1:1

PWMPIN FPOR Motor Control PWM Module Pin mode

= PWM module pins controlled by PORT register at device Reset (tri-stated)

0 = PWM module pins controlled by PWM module at device Reset (configured as

output pins)

TABLE 3-2: dsPIC33F/PIC24H CONFIGURATION BITS DESCRIPTION (CONTINUED)

Bit Field Register Description