PIC18F2620-I/SO【PDF 63/286 页】IC MCU FLASH 32KX16 28SOIC

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Sheet目录3821

59页 60页 61页 62页 [63页]64页 65页 66页 67页

1996 Microchip Technology Inc.

DS30412C-page 155

PIC17C4X

Applicable Devices 42 R42 42A 43 R43 44

17.4

Timing Diagrams and Specications

FIGURE 17-2: EXTERNAL CLOCK TIMING

TABLE 17-2:

EXTERNAL CLOCK TIMING REQUIREMENTS

Parameter

No.

Sym

Characteristic

Min

Typ

Max

Units

Conditions

Fosc

External CLKIN Frequency

(Note 1)

—

MHz

EC osc mode - PIC17C42-16

- PIC17C42-25

Oscillator Frequency

(Note 1)

—

MHz

RC osc mode

XT osc mode - PIC17C42-16

- PIC17C42-25

LF osc mode

Tosc

External CLKIN Period

(Note 1)

62.5

—

EC osc mode - PIC17C42-16

- PIC17C42-25

Oscillator Period

(Note 1)

250

62.5

500

—

1,000

—

RC osc mode

XT osc mode - PIC17C42-16

- PIC17C42-25

LF osc mode

2TCY

Instruction Cycle Time (Note 1)

160

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 unstable oscillator operation and/or higher than expected current consump-

tion. 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.

OSC1

OSC2

In EC and RC modes only.

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