PIC16C71 datasheet(125/337 Pages) MICROCHIP

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DS30234D-page 125

PIC16C6X

13.2

Oscillator Conﬁgurations

13.2.1

OSCILLATOR TYPES

The PIC16CXX can be operated in four different oscil-

lator modes. The user can program two conﬁguration

bits (FOSC1 and FOSC0) to select one of these four

modes:

• LP

Low Power Crystal

• XT

Crystal/Resonator

• HS

High Speed Crystal/Resonator

• RC

Resistor/Capacitor

13.2.2

CRYSTAL OSCILLATOR/CERAMIC

RESONATORS

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

is connected to the OSC1/CLKIN and OSC2/CLKOUT

pins

establish

oscillation

(Figure 13-4).

The

PIC16CXX oscillator design requires the use of a par-

allel cut crystal. Use of a series cut crystal may give a

frequency out of the crystal manufacturers speciﬁca-

tions. When in LP, XT, or HS modes, the device can

have an external clock source to drive the OSC1/CLKIN

pin (Figure 13-5).

Applicable Devices

61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67

FIGURE 13-4: CRYSTAL/CERAMIC

RESONATOR OPERATION

(HS, XT OR LP OSC

CONFIGURATION)

FIGURE 13-5: EXTERNAL CLOCK INPUT

OPERATION (HS, XT OR LP

OSC CONFIGURATION)

XTAL

OSC2

Note1

OSC1

SLEEP

To internal

logic

PIC16CXX

See Table 13-1, Table 13-3, Table 13-2 and Table 13-4 for

recommended values of C1 and C2.

Note 1:

A series resistor may be required for AT strip

cut crystals.

For the PIC16C61 the buffer is on the OSC2

pin, all other devices have the buffer on the

OSC1 pin.

(2)

To internal

logic

OSC1

OSC2

Open

Clock from

ext. system

PIC16CXX

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