參數(shù)資料
型號(hào)： PIC16F818
廠(chǎng)商： Microchip Technology Inc.
英文描述： 18/20-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology(18/20引腳，納瓦技術(shù)增強(qiáng)FLASH微控制器)
中文描述： 18/20-Pin增強(qiáng)型閃存微控制器采用納瓦技術(shù)（18/20引腳，納瓦技術(shù)增強(qiáng)閃存微控制器）
文件頁(yè)數(shù)： 62/164頁(yè)
文件大?。?/td> 3045K
代理商： PIC16F818
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PIC16F818/819
DS39598C-page 60
Preliminary
2002 Microchip Technology Inc.
7.6
Timer1 Oscillator
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 oscilla-
tor 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.
FIGURE 7-3:
EXTERNAL COMPONENTS
FOR THE TIMER1 LP
OSCILLATOR
TABLE 7-1:
CAPACITOR SELECTION FOR
THE TIMER1 OSCILLATOR
7.7
Timer1 Oscillator Layout
Considerations
The Timer1 oscillator circuit draws very little power dur-
ing operation. Due to the low power nature of the oscil-
lator, 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
SS
or V
DD
.
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 7-4:
OSCILLATOR CIRCUIT
WITH GROUNDED
GUARD RING
7.8
Resetting Timer1 Using a CCP
Trigger Output
If the CCP1 module is configured in Compare mode to
generate
a
“special
(CCP1M3:CCP1M0 =
1011)
, the signal will reset
Timer1 and start an A/D conversion (if the A/D module
is enabled).
event
trigger"
signal
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 regis-
ter pair effectively becomes the period register for
Timer1.
Osc Type
Freq
C1
C2
LP
32 kHz
33 pF
33 pF
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
components.
values
of
external
4:
Capacitor values are for design guidance
only.
PIC16F818/819
T1OSI
T1OSO
C2
33 pF
C1
33 pF
XTAL
32.768 kHz
Note:
See the Notes with Table 7-1 for additional
information about capacitor selection.
OSC1
V
SS
OSC2
RB7
RB6
RB5
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參數(shù)描述
PIC16F818-E/ML 功能描述:8位微控制器 -MCU 1.75KB 128RAM 16 I/O Ext Temp QFN28 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F818-E/P 功能描述:8位微控制器 -MCU 1.75KB 128RAM 16 I/O Ext Temp PDIP18 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F818-E/SO 功能描述:8位微控制器 -MCU 1.75KB 128RAM 16 I/O Ext Temp SOIC18 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F818-E/SS 功能描述:8位微控制器 -MCU 1.75KB 128RAM 16 I/O Ext Temp SSOP20 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16F818-E/SS 制造商:Microchip Technology Inc 功能描述:IC 8BIT MCU PIC16F 20MHz SSOP-20 制造商:Microchip Technology Inc 功能描述:IC, 8BIT MCU, PIC16F, 20MHz, SSOP-20
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