Datasheet

© 2009 Microchip Technology Inc. DS39775C-page 41
PIC18F87J50 FAMILY
TABLE 2-5: OSCILLATOR CONFIGURATION OPTIONS FOR USB OPERATION
Input Oscillator
Frequency
PLL Division
(PLLDIV2:PLLDIV0)
Clock Mode
(FOSC2:FOSC0)
MCU Clock Division
(CPDIV1:CPDIV0)
Microcontroller
Clock Frequency
48 MHz N/A EC
None (11)48MHz
÷2 (10) 24 MHz
÷3 (01)16MHz
÷6 (00)8MHz
48 MHz ÷12 (000)ECPLL
None (11)48MHz
÷2 (10) 24 MHz
÷3 (01)16MHz
÷6 (00)8MHz
40 MHz ÷10 (001)ECPLL
None (11)48MHz
÷2 (10) 24 MHz
÷3 (01)16MHz
÷6 (00)8MHz
24 MHz ÷6 (010) HSPLL, ECPLL
None (11)48MHz
÷2 (10) 24 MHz
÷3 (01)16MHz
÷6 (00)8MHz
24 MHz N/A
(1)
EC, HS
None (11) 24 MHz
÷2 (10)12MHz
÷3 (01)8MHz
÷6 (00)4MHz
20 MHz ÷5 (011) HSPLL, ECPLL
None (11)48MHz
÷2 (10) 24 MHz
÷3 (01)16MHz
÷6 (00)8MHz
16 MHz ÷4 (100) HSPLL, ECPLL
None (11)48MHz
÷2 (10) 24 MHz
÷3 (01)16MHz
÷6 (00)8MHz
12 MHz ÷3 (101) HSPLL, ECPLL
None (11)48MHz
÷2 (10) 24 MHz
÷3 (01)16MHz
÷6 (00)8MHz
8MHz ÷2 (110) HSPLL, ECPLL
None (11)48MHz
÷2 (10) 24 MHz
÷3 (01)16MHz
÷6 (00)8MHz
4MHz ÷1 (111) HSPLL, ECPLL
None (11)48MHz
÷2 (10) 24 MHz
÷3 (01)16MHz
÷6 (00)8MHz
Legend: All clock frequencies, except 24 MHz, are exclusively associated with full-speed USB operation (USB clock of 48 MHz).
Bold is used to highlight clock selections that are compatible with low-speed USB operation (system clock of 24 MHz,
USB clock of 6 MHz).
Note 1: Only valid for low-speed USB operation.