PIC16C641 Datasheet

IC型号：
PIC16C641
PDF描述：
8-Bit EPROM Microcontrollers with Analog Comparators
文件大小：
661.21KB
PDF页数：
137页
芯片厂家：
MICROCHIP

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PIC16C64X & PIC16C66X

9.2

9.2.1

Oscillator Con铿乬urations

OSCILLATOR TYPES

TABLE 9-1:

CAPACITOR SELECTION

FOR CERAMIC RESONATORS

(PRELIMINARY)

Ranges tested:

The PIC16CXXX can be operated in four different

oscillator modes. The user can program two

con铿乬uration bits (FOSC1 and FOSC0) to select one of

these four modes:

鈥?/div>

Low Power Crystal

Crystal/Resonator

High Speed Crystal/Resonator

Resistor/Capacitor

CRYSTAL OSCILLATOR / CERAMIC

RESONATORS

Mode

Freq

455 kHz

2.0 MHz

4.0 MHz

8.0 MHz

16.0 MHz

OSC1

22 - 100 pF

15 - 68 pF

10 - 68 pF

10 - 22 pF

9.2.2

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

is connected to the OSC1 and OSC2 pins to establish

oscillation (Figure 9-2). The PIC16CXXX oscillator

design requires the use of a parallel cut crystal. Use of

a series cut crystal may give a frequency out of the

crystal manufacturers speci铿乧ations. When in XT, LP or

HS modes, the device can have an external clock

source to drive the OSC1 pin (Figure 9-3).

Note: Recommended values of C1 and C2 are identical

to the ranges tested table.

Higher capacitance increases the stability of the

oscillator but also increases the start-up time.

These values are for design guidance only. Since

each resonator has its own characteristics, the

user should consult the resonator manufacturer for

appropriate values of external components.

Resonators used:

455 kHz

2.0 MHz

4.0 MHz

8.0 MHz

16.0 MHz

Panasonic EFO-A455K04B

Murata Erie CSA2.00MG

Murata Erie CSA4.00MG

Murata Erie CSA8.00MT

Murata Erie CSA16.00MX

卤

0.3%

卤

0.5%

卤

0.5%

卤

0.5%

卤

0.5%

FIGURE 9-2:

CRYSTAL OPERATION

(OR CERAMIC RESONATOR)

(HS, XT OR LP OSC

CONFIGURATION)

OSC1

All resonators used did not have built-in capacitors.

TABLE 9-2:

CAPACITOR SELECTION

FOR CRYSTAL OSCILLATOR

(PRELIMINARY)

Freq

OSC1

68 - 100 pF

15 - 30 pF

68 - 150 pF

15 - 30 pF

OSC2

68 - 100 pF

15 - 30 pF

150 - 200 pF

15 - 30 pF

XTAL

OSC2

see Note

To internal logic

Mode

SLEEP

PIC16CXXX

See Table 9-1 or Table 9-2 for recommended val-

ues of C1 and C2.

Note:

A series resistor may be required for

AT strip cut crystals.

32 kHz

200 kHz

100 kHz

2 MHz

4 MHz

8 MHz

10 MHz

20 MHz

FIGURE 9-3:

EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR LP

OSC CONFIGURATION)

clock from

ext. system

Open

Higher capacitance increases the stability of the

oscillator but also increases the start-up time.

These values are for design guidance only. Rs may

be required in HS mode as well as XT mode to

avoid overdriving crystals with low drive level spec-

i铿乧ation. Since each crystal has its own

characteristics, the user should consult the crystal

manufacturer for appropriate values of external

components.

OSC1

PIC16CXXX

OSC2

Crystals used:

32.768 kHz

100 kHz

200 kHz

2.0 MHz

4.0 MHz

10.0 MHz

20.0 MHz

Epson C-001R32.768K-A

Epson C-2 100.00 KC-P

STD XTL 200.000 kHz

ECS ECS-20-S-2

ECS ECS-40-S-4

ECS ECS-100-S-4

ECS ECS-200-S-4

卤

20 PPM

卤

20 PPM

卤

20 PPM

卤

50 PPM

卤

50 PPM

卤

50 PPM

卤

50 PPM

漏

1996 Microchip Technology Inc.

Preliminary

DS30559A-page 57

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