PIC16F913 datasheet(75/272 Pages) MICROCHIP

75 / 272 page

Preliminary

DS41250E-page 73

PIC16F917/916/914/913

4.3.2

EC MODE

The External Clock (EC) mode allows an externally

generated logic level as the system clock source.

When operating in this mode, an external clock source

is connected to the OSC1 pin and the RA6 pin is

available for general purpose I/O. Figure 4-2 shows the

pin connections for EC mode.

The Oscillator Start-up Timer (OST) is disabled when

EC mode is selected. Therefore, there is no delay in

operation after a Power-on Reset (POR) or wake-up

from Sleep. Because the PIC16F917/916/914/913

design is fully static, stopping the external clock input

will have the effect of halting the device while leaving all

data intact. Upon restarting the external clock, the

device will resume operation as if no time had elapsed.

FIGURE 4-2:

EXTERNAL CLOCK (EC)

MODE OPERATION

4.3.3

LP, XT, HS MODES

The LP, XT and HS modes support the use of quartz

crystal resonators or ceramic resonators connected to

the OSC1 and OSC2 pins (Figures 4-3 and 4-4). The

mode selects a low, medium or high gain setting of the

internal inverter-amplifier to support various resonator

types and speed.

LP Oscillator mode selects the lowest gain setting of the

internal inverter-amplifier. LP mode current consumption

is the least of the three modes. This mode is best suited

to drive resonators with a low drive level specification, for

example, tuning fork type crystals.

XT Oscillator mode selects the intermediate gain

setting of the internal inverter-amplifier. XT mode

current consumption is the medium of the three modes.

This mode is best suited to drive resonators with a

medium

drive

level

specification,

for

example,

low-frequency/AT-cut quartz crystal resonators.

HS Oscillator mode selects the highest gain setting of

the

internal

inverter-amplifier.

mode

current

consumption is the highest of the three modes. This

mode is best suited for resonators that require a high

drive setting,

for example, high-frequency/AT-cut

quartz crystal resonators or ceramic resonators.

Figures 4-3 and 4-4 show typical circuits for quartz

crystal and ceramic resonators, respectively.

RA6/OSC2/CLKO/T1OSO

RA6

Clock

PIC16F917/916/914/913

Internal

FOSC

FOSC<2:0> = 011

OSC1/

Clock

CLKIN

(External

System)

Note:

In the past, the sources for the LP oscilla-

tor and Timer1 oscillator have been sepa-

rate circuits. In this family of devices, the

LP oscillator and Timer1 oscillator use the

same oscillator circuitry. When using a

device configured for the LP oscillator and

with T1OSCEN = 1, the source of the

clock for each function comes from the

same oscillator block.

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