PIC32MX1XX Datasheet, PDF (229/320 Pages) Microchip Technology – 32-bit Microcontrollers (up to 128 KB Flash and 32 KB SRAM) with Audio and Graphics Interfaces, USB, and Advanced Analog

PIC32MX1XX/2XX
REGISTER 26-2: DEVCFG1: DEVICE CONFIGURATION WORD 1 (CONTINUED)
bit 15-14 FCKSM<1:0>: Clock Switching and Monitor Selection Configuration 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
bit 13-12 FPBDIV<1:0>: Peripheral Bus Clock Divisor Default Value bits
11 = PBCLK is SYSCLK divided by 8
10 = PBCLK is SYSCLK divided by 4
01 = PBCLK is SYSCLK divided by 2
00 = PBCLK is SYSCLK divided by 1
bit 11 Reserved: Write ‘1’
bit 10 OSCIOFNC: CLKO Enable Configuration bit
1 = CLKO output disabled
0 = CLKO output signal active on the OSCO pin; Primary Oscillator must be disabled or configured for the
External Clock mode (EC) for the CLKO to be active (POSCMOD<1:0> = 11 or 00)
bit 9-8 POSCMOD<1:0>: Primary Oscillator Configuration bits
11 = Primary Oscillator disabled
10 = HS Oscillator mode selected
01 = XT Oscillator mode selected
00 = External Clock mode selected
bit 7
IESO: Internal External Switchover bit
1 = Internal External Switchover mode is enabled (Two-Speed Start-up is enabled)
0 = Internal External Switchover mode is disabled (Two-Speed Start-up is disabled)
bit 6
Reserved: Write ‘1’
bit 5
FSOSCEN: Secondary Oscillator Enable bit
1 = Enable Secondary Oscillator
0 = Disable Secondary Oscillator
bit 4-3 Reserved: Write ‘1’
bit 2-0 FNOSC<2:0>: Oscillator Selection bits
111 = Fast RC Oscillator with divide-by-N (FRCDIV)
110 = FRCDIV16 Fast RC Oscillator with fixed divide-by-16 postscaler
101 = Low-Power RC Oscillator (LPRC)
100 = Secondary Oscillator (SOSC)
011 = Primary Oscillator (POSC) with PLL module (XT+PLL, HS+PLL, EC+PLL)
010 = Primary Oscillator (XT, HS, EC)⁽¹⁾
001 = Fast RC Oscillator with divide-by-N with PLL module (FRCDIV+PLL)
000 = Fast RC Oscillator (FRC)
Note 1: Do not disable the POSC (POSCMOD = 11) when using this oscillator source.
© 2011-2012 Microchip Technology Inc.
Preliminary
DS61168D-page 229