PIC18F2450_08 Datasheet, PDF (30/324 Pages) Microchip Technology – 28/40/44-Pin, High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

PIC18F2450/4450
TABLE 2-3: OSCILLATOR CONFIGURATION OPTIONS FOR USB OPERATION
Input Oscillator
Frequency
PLL Division
(PLLDIV2:PLLDIV0)
Clock Mode
(FOSC3:FOSC0)
MCU Clock Division
(CPUDIV1:CPUDIV0)
Microcontroller
Clock Frequency
None (00)
48 MHz
48 MHz
N/A⁽¹⁾
EC, ECIO
÷2 (01)
÷3 (10)
24 MHz
16 MHz
÷4 (11)
12 MHz
None (00)
48 MHz
EC, ECIO
÷2 (01)
÷3 (10)
24 MHz
16 MHz
48 MHz
÷12 (111)
÷4 (11)
÷2 (00)
12 MHz
48 MHz
ECPLL, ECPIO
÷3 (01)
÷4 (10)
32 MHz
24 MHz
÷6 (11)
16 MHz
None (00)
40 MHz
EC, ECIO
÷2 (01)
÷3 (10)
20 MHz
13.33 MHz
40 MHz
÷10 (110)
÷4 (11)
÷2 (00)
10 MHz
48 MHz
ECPLL, ECPIO
÷3 (01)
÷4 (10)
32 MHz
24 MHz
÷6 (11)
16 MHz
None (00)
24 MHz
HS, EC, ECIO
÷2 (01)
÷3 (10)
12 MHz
8 MHz
24 MHz
÷6 (101)
÷4 (11)
÷2 (00)
6 MHz
48 MHz
HSPLL, ECPLL, ECPIO
÷3 (01)
÷4 (10)
32 MHz
24 MHz
÷6 (11)
16 MHz
None (00)
20 MHz
HS, EC, ECIO
÷2 (01)
÷3 (10)
10 MHz
6.67 MHz
20 MHz
÷5 (100)
÷4 (11)
÷2 (00)
5 MHz
48 MHz
HSPLL, ECPLL, ECPIO
÷3 (01)
÷4 (10)
32 MHz
24 MHz
÷6 (11)
16 MHz
None (00)
16 MHz
HS, EC, ECIO
÷2 (01)
÷3 (10)
8 MHz
5.33 MHz
16 MHz
÷4 (011)
÷4 (11)
÷2 (00)
4 MHz
48 MHz
HSPLL, ECPLL, ECPIO
÷3 (01)
÷4 (10)
32 MHz
24 MHz
÷6 (11)
16 MHz
Legend:
Note 1:
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).
Only valid when the USBDIV Configuration bit is cleared.
DS39760D-page 28
© 2008 Microchip Technology Inc.