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

7.6

Timer1 Oscillator

7.7

A crystal oscillator circuit is built between pins T1OSI

(input) and T1OSO (amplifier output). It is enabled by

setting control bit, T1OSCEN (T1CON<3>). The oscil-

lator is a low-power oscillator, rated up to 32.768 kHz.

It will continue to run during Sleep. It is primarily

intended for a 32 kHz crystal. The circuit for a typical LP

oscillator is shown in Figure 7-3. Table 7-1 shows the

capacitor selection for the Timer1 oscillator.

The user must provide a software time delay to ensure

proper oscillator start-up.

Timer1 Oscillator Layout

Considerations

The Timer1 oscillator circuit draws very little power

during operation. Due to the low-power nature of the

oscillator, it may also be sensitive to rapidly changing

signals in close proximity.

The oscillator circuit, shown in Figure 7-3, should be

located as close as possible to the microcontroller.

There should be no circuits passing within the oscillator

circuit boundaries other than V

or V

If a high-speed circuit must be located near the oscilla-

tor, a grounded guard ring around the oscillator circuit,

as shown in Figure 7-4, may be helpful when used on

a single sided PCB or in addition to a ground plane.

FIGURE 7-3:

EXTERNAL

COMPONENTS FOR THE

TIMER1 LP OSCILLATOR

PIC16F818/819

T1OSI

XTAL

32.768 kHz

T1OSO

FIGURE 7-4:

33 pF

OSCILLATOR CIRCUIT

WITH GROUNDED

GUARD RING

OSC1

OSC2

33 pF

Note:

See the Notes with Table 7-1 for additional

information about capacitor selection.

RB7

TABLE 7-1:

Osc Type

CAPACITOR SELECTION FOR

THE TIMER1 OSCILLATOR

Freq

32 kHz

33 pF

RB6

RB5

Note 1:

Microchip suggests this value as a starting

point in validating the oscillator circuit.

Higher capacitance increases the stability

of the oscillator but also increases the

start-up time.

Since each resonator/crystal has its own

characteristics, the user should consult

the resonator/crystal manufacturer for

appropriate

values

external

components.

Capacitor values are for design guidance

only.

7.8

Resetting Timer1 Using a CCP

Trigger Output

If the CCP1 module is configured in Compare mode to

generate

鈥渟pecial

event

trigger鈥?/div>

signal

(CCP1M3:CCP1M0 =

1011),

the signal will reset

Timer1 and start an A/D conversion (if the A/D module

is enabled).

Timer1 must be configured for either Timer or Synchro-

nized Counter mode to take advantage of this feature.

If Timer1 is running in Asynchronous Counter mode,

this Reset operation may not work.

In the event that a write to Timer1 coincides with a

special event trigger from CCP1, the write will take

precedence.

In this mode of operation, the CCPR1H:CCPR1L

Timer1.

DS39598D-page 60

Preliminary

铮?/div>

2003 Microchip Technology Inc.

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