參數(shù)資料
型號： PIC16F818
廠商： 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FLASH微控制器)
中文描述： 18/20-Pin增強型閃存微控制器采用納瓦技術(shù)（18/20引腳，納瓦技術(shù)增強閃存微控制器）
文件頁數(shù)： 37/164頁
文件大?。?/td> 3045K
代理商： PIC16F818
2002 Microchip Technology Inc.
Preliminary
DS39598C-page 35
PIC16F818/819
4.4
RC Oscillator
For timing insensitive applications, the “RC” and
“RCIO” device options offer additional cost savings.
The RC oscillator frequency is a function of the supply
voltage, the resistor (R
EXT
) and capacitor (C
EXT
) val-
ues, and the operating temperature. In addition to this,
the oscillator frequency will vary from unit to unit due to
normal manufacturing variation. Furthermore, the dif-
ference in lead frame capacitance between package
types will also affect the oscillation frequency, espe-
cially for low C
EXT
values. The user also needs to take
into account variation due to tolerance of external R
and C components used. Figure 4-4 shows how the
R/C combination is connected.
In the RC Oscillator mode, the oscillator frequency
divided by 4 is available on the OSC2 pin. This signal may
be used for test purposes or to synchronize other logic.
FIGURE 4-4:
RC OSCILLATOR MODE
The RCIO Oscillator mode (Figure 4-5) functions like
the RC mode, except that the OSC2 pin becomes an
additional general purpose I/O pin. The I/O pin
becomes bit 6 of PORTA (RA6).
FIGURE 4-5:
RCIO OSCILLATOR MODE
4.5
Internal Oscillator Block
The PIC16F818/819 devices include an internal oscil-
lator block, which generates two different clock signals;
either can be used as the system’s clock source. This
can eliminate the need for external oscillator circuits on
the OSC1 and/or OSC2 pins.
The main output (INTOSC) is an 8 MHz clock source,
which can be used to directly drive the system clock. It
also drives the INTOSC postscaler, which can provide
a range of clock frequencies from 125 kHz to 4 MHz.
The other clock source is the internal RC oscillator
(INTRC), which provides a 31.25 kHz (32
μ
s nominal
period) output. The INTRC oscillator is enabled by
selecting the INTRC as the system clock source, or
when any of the following are enabled:
Power-up Timer
Watchdog Timer
These features are discussed in greater detail in
Section 12.0, “Special Features of the CPU”.
The clock source frequency (INTOSC direct, INTRC
direct, or INTOSC postscaler) is selected by configuring
the IRCF bits of the OSCCON register (page 38).
OSC2/CLKO
C
EXT
R
EXT
PIC16F818/819
OSC1
F
OSC
/4
Internal
Clock
V
DD
V
SS
Recommended values: 3 k
≤
R
EXT
≤
100 k
C
EXT
> 20 pF
C
EXT
R
EXT
PIC16F818/819
OSC1
Internal
Clock
V
DD
V
SS
Recommended values: 3 k
≤
R
EXT
≤
100 k
C
EXT
> 20 pF
I/O (OSC2)
RA6
Note:
Throughout this data sheet, when referring
specifically
to a generic clock source, the
term “INTRC” may also be used to refer to
the Clock modes using the internal oscilla-
tor block. This is regardless of whether the
actual frequency used is INTOSC (8 MHz),
the
INTOSC
postscaler,
(31.25 kHz).
or
INTRC
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相關(guān)代理商/技術(shù)參數(shù)
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)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小: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)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小: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)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小: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)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小: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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