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

FIGURE 4-2:

CERAMIC RESONATOR

OPERATION (HS OR XT

OSC CONFIGURATION)

OSC1

(1)

4.3

External Clock Input

PIC16F818/819

The ECIO Oscillator mode requires an external clock

source to be connected to the OSC1 pin. There is no

oscillator start-up time required after a Power-on Reset

or after an exit from Sleep mode.

In the ECIO Oscillator mode, the OSC2 pin becomes

an additional general purpose I/O pin. The I/O pin

becomes bit 6 of PORTA (RA6). Figure 4-3 shows the

pin connections for the ECIO Oscillator mode.

RES

OSC2

(1)

(3)

Sleep

(2)

To Internal

Logic

FIGURE 4-3:

Note 1:

See Table 4-2 for typical values of C1 and C2.

A series resistor (R

) may be required.

varies with the resonator chosen (typically

between 2 M鈩?to 10 M鈩?.

Clock from

Ext. System

RA6

EXTERNAL CLOCK INPUT

OPERATION

(ECIO CONFIGURATION)

OSC1/CLKI

PIC16F818/819

I/O (OSC2)

TABLE 4-2:

CERAMIC RESONATORS (FOR

DESIGN GUIDANCE ONLY)

Typical Capacitor Values Used:

Mode

Freq

455 kHz

2.0 MHz

4.0 MHz

8.0 MHz

16.0 MHz

OSC1

56 pF

47 pF

33 pF

27 pF

22 pF

OSC2

56 pF

47 pF

33 pF

27 pF

22 pF

Capacitor values are for design guidance only.

These capacitors were tested with the resonators

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:

When using resonators with frequencies

above 3.5 MHz, the use of HS mode rather

than XT mode, is recommended. HS

mode may be used at any V

for which

the controller is rated. If HS is selected, it

is possible that the gain of the oscillator

will overdrive the resonator. Therefore, a

series resistor should be placed between

the OSC2 pin and the resonator. As a

good starting point, the recommended

value of R

is 330

鈩?

DS39598D-page 34

Preliminary

铮?/div>

2003 Microchip Technology Inc.

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