PIC18F4620-I/ML【PDF 95/286 页】IC MCU FLASH 32KX16 44QFN

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Sheet目录3818

91页 92页 93页 94页 [95页]96页 97页 98页 99页

PIC17C4X

DS30412C-page 184

1996 Microchip Technology Inc.

Applicable Devices 42 R42 42A 43 R43 44

19.5

Timing Diagrams and Specications

FIGURE 19-2: EXTERNAL CLOCK TIMING

TABLE 19-2:

EXTERNAL CLOCK TIMING REQUIREMENTS

Param

No.

Sym

Characteristic

Min

Typ

Max

Units

Conditions

Fosc

External CLKIN Frequency

(Note 1)

—

MHz

EC osc mode - 08 devices (8 MHz devices)

- 16 devices (16 MHz devices)

- 25 devices (25 MHz devices)

- 33 devices (33 MHz devices)

Oscillator Frequency

(Note 1)

—

MHz

RC osc mode

XT osc mode - 08 devices (8 MHz devices)

- 16 devices (16 MHz devices)

- 25 devices (25 MHz devices)

- 33 devices (33 MHz devices)

LF osc mode

Tosc

External CLKIN Period

(Note 1)

125

62.5

30.3

—

EC osc mode - 08 devices (8 MHz devices)

- 16 devices (16 MHz devices)

- 25 devices (25 MHz devices)

- 33 devices (33 MHz devices)

Oscillator Period

(Note 1)

250

125

62.5

30.3

500

—

1,000

—

RC osc mode

XT osc mode - 08 devices (8 MHz devices)

- 16 devices (16 MHz devices)

- 25 devices (25 MHz devices)

- 33 devices (33 MHz devices)

LF osc mode

2TCY

Instruction Cycle Time

(Note 1)

121.2

4/Fosc

TosL,

TosH

Clock in (OSC1)

high or low time

—

EC oscillator

TosR,

TosF

Clock in (OSC1)

rise or fall time

—

EC oscillator

Data in “Typ” column is at 5V, 25C unless otherwise stated. These parameters are for design guidance only and are not

tested.

These parameters are for design guidance only and are not tested, nor characterized.

Note 1:

Instruction cycle period (TCY) equals four times the input oscillator time base period. All specied values are based on

characterization data for that particular oscillator type under standard operating conditions with the device executing code.

Exceeding these specied 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

OSC2

In EC and RC modes only.

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