PIC16F819 Datasheet

IC型号：
PIC16F819
PDF描述：
18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Tech...
文件大小：
68.31KB
PDF页数：
176页
芯片厂家：
MICROCHIP

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PIC16F818/819

4.0

4.1

OSCILLATOR

CONFIGURATIONS

Oscillator Types

TABLE 4-1:

CAPACITOR SELECTION FOR

CRYSTAL OSCILLATOR (FOR

DESIGN GUIDANCE ONLY)

Crystal

Freq

32 kHz

200 kHz

1 MHz

4 MHz

Typical Capacitor Values

Tested:

33 pF

15 pF

56 pF

15 pF

The PIC16F818/819 can be operated in eight different

oscillator modes. The user can program three configu-

ration bits (F

OSC

2:F

OSC

0) to select one of these eight

modes (modes 5-8 are new PIC16 oscillator

configurations):

RCIO

INTIO1

INTIO2

ECIO

Low-Power Crystal

Crystal/Resonator

High-Speed Crystal/Resonator

External Resistor/Capacitor with

OSC

/4 output on RA6

External Resistor/Capacitor with

I/O on RA6

Internal Oscillator with F

OSC

output on RA6 and I/O on RA7

Internal Oscillator with I/O on RA6

and RA7

External Clock with I/O on RA6

Osc Type

33 pF

15 pF

56 pF

15 pF

4 MHz

8 MHz

20 MHz

Capacitor values are for design guidance only.

These capacitors were tested with the crystals listed

below for basic start-up and operation. These values

were not optimized.

Different capacitor values may be required to produce

acceptable oscillator operation. The user should test

the performance of the oscillator over the expected

and temperature range for the application.

See the notes following this table for additional

information.

Note 1:

Higher capacitance increases the stability

of oscillator but also increases the start-up

time.

Since each crystal has its own character-

istics, the user should consult the crystal

manufacturer for appropriate values of

external components.

Rs may be required in HS mode, as well

as XT mode, to avoid overdriving crystals

with low drive level specification.

Always verify oscillator performance over

the V

and temperature range that is

expected for the application.

4.2

Crystal Oscillator/Ceramic

Resonators

In XT, LP or HS modes, a crystal or ceramic resonator

is connected to the OSC1/CLKI and OSC2/CLKO pins

to establish oscillation (see Figure 4-1 and Figure 4-2).

The PIC16F818/819 oscillator design requires the use

of a parallel cut crystal. Use of a series cut crystal may

give a frequency out of the crystal manufacturer鈥檚

specifications.

FIGURE 4-1:

CRYSTAL OPERATION

(HS, XT OR LP OSC

CONFIGURATION)

OSC1

PIC16F818/819

(1)

XTAL

OSC2

(1)

(2)

To Internal

Logic

(3)

Sleep

Note 1:

See Table 4-1 for typical values of C1 and

C2.

A series resistor (R

) may be required for AT

strip cut crystals.

varies with the crystal chosen (typically

between 2 M鈩?to 10 M鈩?.

铮?/div>

2003 Microchip Technology Inc.

Preliminary

DS39598D-page 33

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