PIC16CE625 Datasheet

IC型号：
PIC16CE625
PDF描述：
OTP 8-Bit CMOS MCU with EEPROM Data Memory
文件大小：
1208.41KB
PDF页数：
113页
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PIC16CE62X

10.2

10.2.1

Oscillator Con铿乬urations

OSCILLATOR TYPES

TABLE 10-1:

Ranges Tested:

Mode

CERAMIC RESONATORS,

PIC16CE62X

The PIC16CE62X can be operated in four different

oscillator options. 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

Freq

455 kHz

2.0 MHz

4.0 MHz

8.0 MHz

16.0 MHz

OSC1

68 - 100 pF

15 - 68 pF

10 - 68 pF

10 - 22 pF

OSC2

68 - 100 pF

15 - 68 pF

10 - 68 pF

10 - 22 pF

These values are for design guidance only.

See

notes at bottom of page.

10.2.2

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%

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

is connected to the OSC1 and OSC2 pins to establish

oscillation (Figure 10-2). The PIC16CE62X) 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 10-3).

All resonators used did not have built-in capacitors.

TABLE 10-2:

FIGURE 10-2: CRYSTAL OPERATION

(OR CERAMIC RESONATOR)

(HS, XT OR LP OSC

CONFIGURATION)

OSC1

XTAL

OSC2

see Note

To internal logic

CAPACITOR SELECTION

FOR CRYSTAL OSCILLATOR,

PIC16CE62X

Crystal

Freq

32 kHz

200 kHz

1 MHz

4 MHz

Cap. Range

33 pF

15 pF

47-68 pF

15 pF

15-33 pF

Cap. Range

33 pF

15 pF

47-68 pF

15 pF

15-33 pF

Osc Type

SLEEP

PIC16CE62X

4 MHz

8 MHz

20 MHz

See Table 10-1 and Table 10-2 for recommended

values of C1 and C2.

Note:

A series resistor may be required for

AT strip cut crystals.

These values are for design guidance only.

See

notes at bottom of page.

Crystals Used

32 kHz

200 kHz

1 MHz

4 MHz

8 MHz

20 MHz

Epson C-001R32.768K-A

STD XTL 200.000KHz

ECS ECS-10-13-1

ECS ECS-40-20-1

EPSON CA-301 8.000M-C

EPSON CA-301 20.000M-C

卤

20 PPM

卤

20 PPM

卤

50 PPM

卤

50 PPM

卤

30 PPM

卤

30 PPM

FIGURE 10-3: EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR LP

OSC CONFIGURATION)

Clock from

ext. system

Open

OSC1

PIC16CE62X

OSC2

Recommended values of C1 and C2 are identical to the

ranges tested table.

Higher capacitance increases the stability of oscillator but

also increases the start-up time.

Since each resonator/crystal has its own characteristics,

the user should consult the resonator/crystal manufac-

turer 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 speci铿乧a-

tion.

漏

1998 Microchip Technology Inc.

Preliminary

DS40182A-page 51

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