PIC16F84A datasheet(189/337 Pages) MICROCHIP

189 / 337 page

DS30234D-page 189

PIC16C6X

Applicable Devices 61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67

18.5

Timing Diagrams and Speciﬁcations

FIGURE 18-2: EXTERNAL CLOCK TIMING

TABLE 18-2:

EXTERNAL CLOCK TIMING REQUIREMENTS

Parameter

No.

Sym

Characteristic

Min

Typ†

Max

Units

Conditions

Fosc

External CLKIN Frequency

(Note 1)

—

MHz

XT and RC osc mode

—

MHz

HS osc mode (-04)

—

MHz

HS osc mode (-10)

—

MHz

HS osc mode (-20)

—

200

kHz

LP osc mode

Oscillator Frequency

(Note 1)

—

MHz

RC osc mode

0.1

—

MHz

XT osc mode

—

MHz

HS osc mode

—

200

kHz

LP osc mode

Tosc

External CLKIN Period

(Note 1)

250

—

XT and RC osc mode

250

—

HS osc mode (-04)

100

—

HS osc mode (-10)

—

HS osc mode (-20)

5—

—

µs

LP osc mode

Oscillator Period

(Note 1)

250

—

RC osc mode

250

—

10,000

XT osc mode

250

—

250

HS osc mode (-04)

100

—

250

HS osc mode (-10)

—

1,000

HS osc mode (-20)

5—

—

µs

LP osc mode

2TCY

Instruction Cycle Time (Note 1)

200

TCY

TCY = 4/FOSC

TosL,

TosH

External Clock in (OSC1) High

or Low Time

100

—

XT oscillator

2.5

—

µs

LP oscillator

—

HS oscillator

TosR,

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 con-

sumption. All devices are tested to operate at "min." values with an external clock applied to the OSC1/CLKIN pin.

When an external clock input is used, the "Max." cycle time limit is "DC" (no clock) for all devices.

OSC1

CLKOUT

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