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
(1)
48 MHz
N/A
EC, ECIO
None (00)
÷2 (01)
÷3 (10)
÷4 (11)
None (00)
÷2 (01)
÷3 (10)
÷4 (11)
÷2 (00)
÷3 (01)
÷4 (10)
÷6 (11)
None (00)
÷2 (01)
÷3 (10)
÷4 (11)
÷2 (00)
÷3 (01)
÷4 (10)
÷6 (11)
None (00)
÷2 (01)
÷3 (10)
÷4 (11)
÷2 (00)
÷3 (01)
÷4 (10)
÷6 (11)
None (00)
÷2 (01)
÷3 (10)
÷4 (11)
÷2 (00)
÷3 (01)
÷4 (10)
÷6 (11)
None (00)
÷2 (01)
÷3 (10)
÷4 (11)
÷2 (00)
÷3 (01)
÷4 (10)
÷6 (11)
48 MHz
24 MHz
16 MHz
12 MHz
48 MHz
24 MHz
16 MHz
12 MHz
48 MHz
32 MHz
24 MHz
16 MHz
40 MHz
20 MHz
13.33 MHz
10 MHz
48 MHz
32 MHz
24 MHz
16 MHz
24 MHz
12 MHz
8 MHz
48 MHz
40 MHz
24 MHz
20 MHz
16 MHz
÷12 (111)
÷10 (110)
÷6 (101)
÷5 (100)
÷4 (011)
EC, ECIO
ECPLL, ECPIO
EC, ECIO
ECPLL, ECPIO
HS, EC, ECIO
6 MHz
HSPLL, ECPLL, ECPIO
HS, EC, ECIO
48 MHz
32 MHz
24 MHz
16 MHz
20 MHz
10 MHz
6.67 MHz
5 MHz
HSPLL, ECPLL, ECPIO
HS, EC, ECIO
48 MHz
32 MHz
24 MHz
16 MHz
16 MHz
8 MHz
5.33 MHz
4 MHz
HSPLL, ECPLL, ECPIO
48 MHz
32 MHz
24 MHz
16 MHz
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 when the USBDIV Configuration bit is cleared.
DS39760A-page 28
Advance Information
© 2006 Microchip Technology Inc.
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