參數(shù)資料
型號： PIC16CR77T-I/PT
廠商： Microchip Technology
文件頁數(shù)： 30/172頁
文件大?。?/td> 0K
描述： IC PIC MCU 8KX14 44TQFP
標(biāo)準(zhǔn)包裝： 1,200
系列： PIC® 16C
核心處理器： PIC
芯體尺寸： 8-位
速度： 20MHz
連通性： I²C，SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 33
程序存儲器容量： 14KB（8K x 14）
程序存儲器類型： ROM
RAM 容量： 368 x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x8b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-TQFP
包裝： 帶卷 (TR)
2007 Microchip Technology Inc.
DS39599G-page 123
PIC18F2220/2320/4220/4320
12.2
Timer1 Oscillator
A crystal oscillator circuit is built-in between pins,
T1OSI (input) and T1OSO (amplifier output). It is
enabled by setting control bit, T1OSCEN (T1CON<3>).
The oscillator is a low-power oscillator rated for 32 kHz
crystals. It will continue to run during all power-
managed modes. The circuit for a typical LP oscillator
is shown in Figure 12-3. Table 12-1 shows the
capacitor selection for the Timer1 oscillator.
The user must provide a software time delay to ensure
proper start-up of the Timer1 oscillator.
FIGURE 12-3:
EXTERNAL COMPONENTS
FOR THE TIMER1 LP
OSCILLATOR
TABLE 12-1:
CAPACITOR SELECTION FOR
THETIMEROSCILLATOR(2,3,4)
12.3
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 12-3, should be
located as close as possible to the microcontroller.
There should be no circuits passing within the oscillator
circuit boundaries other than VSS or VDD.
If a high-speed circuit must be located near the oscilla-
tor (such as the CCP1 pin in output compare or PWM
mode, or the primary oscillator using the OSC2 pin), a
grounded guard ring around the oscillator circuit, as
shown in Figure 12-4, may be helpful when used on a
single-sided PCB or in addition to a ground plane.
FIGURE 12-4:
OSCILLATOR CIRCUIT
WITH GROUNDED GUARD
RING
Osc Type
Freq
C1
C2
LP
32 kHz
22 pF(1)
Note 1: Microchip suggests this value as a starting
point in validating the oscillator circuit.
2: Higher capacitance increases the stability
of the oscillator but also increases the
start-up time.
3: Since each resonator/crystal has its own
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate
values
of
external
components.
4: Capacitor values are for design guidance
only.
Note:
See the Notes with Table 12-1 for additional
information about capacitor selection.
C1
C2
XTAL
PIC18FXXXX
T1OSI
T1OSO
32.768 kHz
22 pF
VDD
OSC1
VSS
OSC2
RC0
RC1
RC2
Note: Not drawn to scale.
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