PIC18F2450-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F2450-I/SO

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

Microchip Technology 

PIC18F2450/4450

21.4.3 TIMING DIAGRAMS AND SPECIFICATIONS

FIGURE 21-5:

EXTERNAL CLOCK TIMING (ALL MODES EXCEPT PLL)

Q4

Q1

Q2

Q3

Q4

Q1

OSC1

CLKO

1

3

3

4

4

2

TABLE 21-6: EXTERNAL CLOCK TIMING REQUIREMENTS

Param.

No.

Symbol

Characteristic

Min

Max Units

Conditions

1A

1

2

3

4

Note 1:

FOSC

External CLKI Frequency(1)

DC

Oscillator Frequency(1)

0.2

48

MHz EC, ECIO Oscillator modes

1

MHz XT, XTPLL Oscillator modes

4

25

MHz HS Oscillator mode

TOSC

External CLKI Period(1)

Oscillator Period(1)

4

20.8

1,000

25

—

5,000

MHz

ns

ns

HSPLL Oscillator mode

EC, ECIO Oscillator modes

XT Oscillator mode

40

250

ns HS Oscillator mode

TCY

Instruction Cycle Time(1)

40

83.3

250

ns HSPLL Oscillator mode

—

ns TCY = 4/FOSC

TosL,

External Clock in (OSC1)

30

TosH

High or Low Time

10

—

ns XT Oscillator mode

—

ns HS Oscillator mode

TosR, External Clock in (OSC1)

—

TosF

Rise or Fall Time

—

20

ns XT Oscillator mode

7.5

ns HS Oscillator mode

Instruction cycle period (TCY) equals four times the input oscillator time base period for all configurations

except PLL. All specified values are based on characterization data for that particular oscillator type under

standard operating conditions with the device executing code. Exceeding these specified limits may result

in an unstable oscillator operation and/or higher than expected current consumption. All devices are tested

to operate at “min.” values with an external clock applied to the OSC1/CLKI pin. When an external clock

input is used, the “max.” cycle time limit is “DC” (no clock) for all devices.

© 2008 Microchip Technology Inc.

DS39760D-page 285

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