PIC18F2455_07 Datasheet, PDF (32/430 Pages) Microchip Technology – 28/40/44-Pin, High Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

PIC18F2455/2550/4455/4550
TABLE 2-3: OSCILLATOR CONFIGURATION OPTIONS FOR USB OPERATION (CONTINUED)
Input Oscillator
Frequency
PLL Division
(PLLDIV2:PLLDIV0)
Clock Mode
(FOSC3:FOSC0)
MCU Clock Division
(CPUDIV1:CPUDIV0)
Microcontroller
Clock Frequency
20 MHz
÷5 (100)
HS, EC, ECIO
None (00)
20 MHz
÷2 (01)
10 MHz
÷3 (10)
6.67 MHz
÷4 (11)
5 MHz
HSPLL, ECPLL, ECPIO
÷2 (00)
48 MHz
÷3 (01)
32 MHz
÷4 (10)
24 MHz
÷6 (11)
16 MHz
16 MHz
÷4 (011)
HS, EC, ECIO
None (00)
16 MHz
÷2 (01)
8 MHz
÷3 (10)
5.33 MHz
÷4 (11)
4 MHz
HSPLL, ECPLL, ECPIO
÷2 (00)
48 MHz
÷3 (01)
32 MHz
÷4 (10)
24 MHz
÷6 (11)
16 MHz
12 MHz
÷3 (010)
HS, EC, ECIO
None (00)
12 MHz
÷2 (01)
6 MHz
÷3 (10)
4 MHz
÷4 (11)
3 MHz
HSPLL, ECPLL, ECPIO
÷2 (00)
48 MHz
÷3 (01)
32 MHz
÷4 (10)
24 MHz
÷6 (11)
16 MHz
8 MHz
÷2 (001)
HS, EC, ECIO
None (00)
8 MHz
÷2 (01)
4 MHz
÷3 (10)
2.67 MHz
÷4 (11)
2 MHz
HSPLL, ECPLL, ECPIO
÷2 (00)
48 MHz
÷3 (01)
32 MHz
÷4 (10)
24 MHz
÷6 (11)
16 MHz
4 MHz
÷1 (000)
XT, HS, EC, ECIO
None (00)
4 MHz
÷2 (01)
2 MHz
÷3 (10)
1.33 MHz
÷4 (11)
1 MHz
HSPLL, ECPLL, XTPLL,
ECPIO
÷2 (00)
÷3 (01)
48 MHz
32 MHz
÷4 (10)
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.
DS39632D-page 30
Preliminary
© 2007 Microchip Technology Inc.