PIC18F258-ESLASHLSQTP datasheet(345/402 Pages) MICROCHIP

345 / 402 page

DS41159E-page 343

PIC18FXX8

27.3.3

TIMING DIAGRAMS AND SPECIFICATIONS

FIGURE 27-6:

EXTERNAL CLOCK TIMING

TABLE 27-6:

EXTERNAL CLOCK TIMING REQUIREMENTS

OSC1

CLKO

Param

No.

Symbol

Characteristic

Min

Max

Units

Conditions

FOSC

External CLKI Frequency(1)

Oscillator Frequency(1)

MHz

EC, ECIO oscillator, -40°C to +85°C

MHz

EC, ECIO oscillator, +85°C to +125°C

MHz

RC oscillator

0.1

MHz

XT oscillator

MHz

HS oscillator, -40°C to +85°C

MHz

HS oscillator, +85°C to +125°C

MHz

HS + PLL oscillator, -40°C to +85°C

6.25

MHz

HS + PLL oscillator, +85°C to +125°C

200

kHz

LP oscillator

1TOSC

External CLKI Period(1)

Oscillator Period(1)

—

EC, ECIO oscillator, -40°C to +85°C

—

EC, ECIO oscillator, +85°C to +125°C

250

—

RC oscillator

250

10,000

XT oscillator

—

HS oscillator, -40°C to +85°C

—

HS oscillator, +85°C to +125°C

100

250

HS + PLL oscillator, -40°C to +85°C

160

250

HS + PLL oscillator, +85°C to +125°C

200

μs

LP oscillator

2TCY

Instruction Cycle Time(1)

100

160

—

TCY = 4/FOSC, -40°C to +85°C

TCY = 4/FOSC, +85°C to +125°C

TosL,

TosH

External Clock in (OSC1)

High or Low Time

—

XT oscillator

2.5

—

LP oscillator

—

μs

HS oscillator

4TosR,

TosF

External Clock in (OSC1)

Rise or Fall Time

—

XT oscillator

—

LP oscillator

—

7.5

HS oscillator

Note 1:

Instruction cycle period (TCY) equals four times the input oscillator time base period. 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.

PIC18F258-E/LSQTP Datasheet(PDF) 345 Page - Microchip Technology

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