PIC18F2450 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F2450

24/40/44-Pin High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

Microchip 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.

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