PIC16F84A datasheet(49/68 Pages) MICROCHIP

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PIC16F84A

Preliminary

DS35007A-page 49

9.5.3

TIMING DIAGRAMS AND SPECIFICATIONS

FIGURE 9-3:

EXTERNAL CLOCK TIMING

OSC1

CLKOUT

TABLE 9-3

EXTERNAL CLOCK TIMING REQUIREMENTS

Parameter

No.

Sym

Characteristic

Min

Typ†

Max

Units

Conditions

FOSC

External CLKIN Frequency

(1)

—

MHz

XT, RC osc

(-04, LF)

—

MHz

XT, RC osc

(-04)

—

MHz

HS osc

(-20)

—

200

kHz

LP osc

(-04, LF)

Oscillator Frequency

(1)

—

MHz

RC osc

(-04, LF)

—

MHz

RC osc

(-04)

0.1

—

MHz

XT osc

(-04, LF)

0.1

—

MHz

XT osc

(-04)

1.0

—

MHz

HS osc

(-20)

—

200

kHz

LP osc

(-04, LF)

Tosc

External CLKIN Period

(1)

500

—

XT, RC osc

(-04, LF)

250

—

XT, RC osc

(-04)

100

—

HS osc

(-20)

5.0

—

µs

LP osc

(-04, LF)

Oscillator Period

(1)

500

—

RC osc

(-04, LF)

250

—

RC osc

(-04)

500

—

10,000

XT osc

(-04, LF)

250

—

10,000

XT osc

(-04)

100

—

1,000

HS osc

(-20)

5.0

—

µs

LP osc

(-04, LF)

2TCY

Instruction Cycle Time

(1)

0.4

4/Fosc

µs

TosL,

TosH

Clock in (OSC1) High or Low

Time

60 *

—

XT osc

(-04, LF)

50 *

—

XT osc

(-04)

2.0 *

—

µs

LP osc

(-04, LF)

35 *

—

HS osc

(-20)

TosR,

TosF

Clock in (OSC1) Rise or Fall Time

25 *

—

XT osc

(-04)

50 *

—

LP osc

(-04, LF)

15 *

—

HS osc

(-20)

These parameters are characterized but no tested.

†

Data in "Typ" column is at 5.0V, 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 pin.

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

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