16F87 datasheet(181/228 Pages) MICROCHIP

181 / 228 page

 2005 Microchip Technology Inc.

DS30487C-page 179

PIC16F87/88

FIGURE 18-4:

EXTERNAL CLOCK TIMING

OSC1

CLKO

TABLE 18-3:

EXTERNAL CLOCK TIMING REQUIREMENTS

Parameter

No.

Sym

Characteristic

Min

Typ†

Max

Units

Conditions

FOSC

External CLKI Frequency

(Note 1)

—

MHz XT and RC Oscillator mode

—

MHz HS Oscillator mode

—

kHz

LP Oscillator mode

Oscillator Frequency

(Note 1)

—

MHz RC Oscillator mode

0.1

—

MHz XT Oscillator mode

—

200

MHz

kHz

HS Oscillator mode

LP Oscillator mode

1TOSC

External CLKI Period

(Note 1)

1000

—

XT and RC Oscillator

modes

—

HS Oscillator mode

—

LP Oscillator mode

Oscillator Period

(Note 1)

250

—

RC Oscillator mode

250

—

10,000

XT Oscillator mode

—

250

HS Oscillator mode

—

LP Oscillator mode

2TCY

Instruction Cycle Time

(Note 1)

200

TCY

TCY = 4/FOSC

TosL,

TosH

External Clock in (OSC1) High or

Low Time

500

—

XT oscillator

2.5

—

LP oscillator

—

HS oscillator

4TosR,

TosF

External Clock in (OSC1) Rise or

Fall Time

—

XT oscillator

—

LP oscillator

—

HS oscillator

† Data in “Typ” column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance

only and are not tested.

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.

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