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PIC18F010T-I/SN

High Performance Microcontrollers

Microchip Technology 

PIC18F010/020

15.4.2 TIMING DIAGRAMS AND SPECIFICATIONS

FIGURE 15-6:

EXTERNAL CLOCK TIMING

Q4

Q1

Q2

Q3

OSC1

CLKOUT

1

3

3

2

Q4

Q1

4

4

TABLE 15-3: EXTERNAL CLOCK TIMING REQUIREMENTS

Param. No. Sym

Characteristic

Min Typ† Max Units

Conditions

FOSC External CLKIN Frequency

DC —

4 MHz RC osc mode

(Note 1)

DC —

4 MHz XT osc mode

DC —

25 MHz HS osc mode

DC —

40 MHz EC osc mode

DC —

200 kHz LP osc mode

Oscillator Frequency

DC —

4 MHz RC osc mode

(Note 1)

0.1 —

4 MHz XT osc mode

4

—

25 MHz HS osc mode

4

—

8.25 MHz HS osc mode

5

—

200 kHz LP osc mode

1

TOSC External CLKIN Period

250 —

—

ns RC osc mode

(Note 1)

100 —

—

ns XT osc mode

40 —

—

ns HS osc mode

120 —

—

ns HS osc mode

30 —

—

ns EC osc mode

5

—

—

µs LP osc mode

Oscillator Period

250 —

—

ns RC osc mode

(Note 1)

0.1 —

10

µs XT osc mode

40 —

100 ns HS osc mode

120 —

100 ns HS osc mode

5

—

—

µs LP osc mode

2

TCY Instruction Cycle Time

100 Tcy

DC

ns TCY = 4/System Clock,

(Note 1)

40 MHz max

3

TosL, External Clock in (OSC1) High 30 —

—

ns XT oscillator

TosH or Low Time

2.5 —

—

µs LP oscillator

10 —

—

ns HS oscillator

4

TosR, External Clock in (OSC1) Rise — —

20

ns XT oscillator

TosF or Fall Time

——

50

ns LP oscillator

——

7.5 ns 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/CLKIN pin. When an external clock input is used, the "max." cycle time limit is

"DC" (no clock) for all devices.

DS41142A-page 152

Preliminary

 2001 Microchip Technology Inc.

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