- 您现在的位置：买卖IC网 > PDF目录299771 > PIC12F635T-E/SN 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO8 PDF资料下载
参数资料
| 型号： | PIC12F635T-E/SN |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, MS-012, SOIC-8 |
| 文件页数： | 125/196页 |
| 文件大小： | 3291K |
| 代理商： | PIC12F635T-E/SN |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页第118页第119页第120页第121页第122页第123页第124页当前第125页第126页第127页第128页第129页第130页第131页第132页第133页第134页第135页第136页第137页第138页第139页第140页第141页第142页第143页第144页第145页第146页第147页第148页第149页第150页第151页第152页第153页第154页第155页第156页第157页第158页第159页第160页第161页第162页第163页第164页第165页第166页第167页第168页第169页第170页第171页第172页第173页第174页第175页第176页第177页第178页第179页第180页第181页第182页第183页第184页第185页第186页第187页第188页第189页第190页第191页第192页第193页第194页第195页第196页
PIC12F635/PIC16F636/639
DS41232B-page 32
Preliminary
2005 Microchip Technology Inc.
3.3.4
EXTERNAL RC MODES
The External Resistor-Capacitor (RC) modes support
the use of an external RC circuit. This allows the
designer maximum flexibility in frequency choice while
keeping costs to a minimum when clock accuracy is not
required. There are two modes, RC and RCIO.
In RC mode, the RC circuit connects to the OSC1 pin.
The OSC2/CLKOUT pin outputs the RC oscillator
frequency divided by 4. This signal may be used to
provide a clock for external circuitry, synchronization,
calibration, test or other application requirements.
Figure 3-5 shows the RC mode connections.
FIGURE 3-5:
RC MODE
In RCIO mode, the RC circuit is connected to the OSC1
pin. The OSC2 pin becomes an additional general
purpose I/O pin. The I/O pin becomes bit 4 of PORTA
(RA4). Figure 3-6 shows the RCIO mode connections.
FIGURE 3-6:
RCIO MODE
The RC oscillator frequency is a function of the supply
voltage, the resistor (REXT) and capacitor (CEXT)
values and the operating temperature. In addition to
this, the oscillator frequency will vary from unit to unit
due to normal threshold voltage. Furthermore, the
difference in lead frame capacitance between package
types will also affect the oscillation frequency or for low
CEXT values. The user also needs to take into account
variation due to tolerance of external RC components
used.
3.4
Internal Clock Modes
The PIC12F635/PIC16F636/639 has two independent,
internal oscillators that can be configured or selected
as the system clock source.
1.
The
HFINTOSC
(High-Frequency
Internal
Oscillator) is factory calibrated and operates at
8 MHz. The frequency of the HFINTOSC can be
user adjusted ±12% via software using the
OSCTUNE register (Register 3-1).
2.
The
LFINTOSC
(Low-Frequency
Internal
Oscillator) is uncalibrated and operates at
approximately 31 kHz.
The system clock speed can be selected via software
using the Internal Oscillator Frequency Select (IRCF)
bits.
The system clock can be selected between external or
internal clock sources via the System Clock Selection
(SCS) bit (see Section 3.5 “Clock Switching”).
3.4.1
LFINTOSC AND LFINTOSCIO
MODES
The LFINTOSC and LFINTOSCIO modes configure
the internal oscillators as the system clock source
when the device is programmed using the oscillator
selection (FOSC) bits in the Configuration Word
register (Register 12-1).
In LFINTOSC mode, the OSC1 pin is available for
general purpose I/O. The OSC2/CLKOUT pin outputs
the selected internal oscillator frequency divided by 4.
The CLKOUT signal may be used to provide a clock for
external circuitry, synchronization, calibration, test or
other application requirements.
In LFINTOSCIO mode, the OSC1 and OSC2 pins are
available for general purpose I/O.
3.4.2
HFINTOSC
The High-Frequency Internal Oscillator (HFINTOSC) is
a factory calibrated 8 MHz internal clock source. The
frequency
of
the
HFINTOSC
can
be
altered
approximately ±12% via software using the OSCTUNE
register (Register 3-1).
The output of the HFINTOSC connects to a postscaler
and multiplexer (see Figure 3-1). One of seven
frequencies can be selected via software using the
IRCF bits (see Section 3.4.4 “Frequency Select Bits
The HFINTOSC is enabled by selecting any frequency
between 8 MHz and 125 kHz (IRCF
≠ 000) as the
system clock source (SCS = 1), or when Two-Speed
Start-up is enabled (IESO = 1 and IRCF
≠ 000).
The HF Internal Oscillator (HTS) bit (OSCCON<2>)
indicates whether the HFINTOSC is stable or not.
OSC2/CLKOUT
CEXT
REXT
PIC12F635/PIC16F636/639
OSC1
FOSC/4
Internal
Clock
VDD
VSS
Recommended values: 3 k
Ω ≤ REXT ≤ 100 kΩ
CEXT > 20 pF
CEXT
REXT
PIC12F635/PIC16F636/639
OSC1
Internal
Clock
VDD
VSS
Recommended values: 3 k
Ω ≤ REXT ≤ 100 kΩ
CEXT > 20 pF
I/O (OSC2)
RA4
相关PDF资料 |
PDF描述 |
|---|---|
| PIC16C65B-04I/PQ | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PQFP44 |
| PIC16C73BT-20E/SS | 8-BIT, OTPROM, 20 MHz, RISC MICROCONTROLLER, PDSO28 |
| PIC16C74B-04I/P | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP40 |
| PIC16LC73B-04I/SS | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDSO28 |
| PIC16LC74B-04I/P | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP40 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PIC12F635T-I/MD | 功能描述:8位微控制器 -MCU 2 KB 64 RAM 6I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC12F635TI/MF | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
| PIC12F635T-I/MF | 功能描述:8位微控制器 -MCU 2kb 64 RAM 6 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC12F635TI/MFQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
| PIC12F635TI/P | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8/14-PIN FLASH-BASED, 8-BIT CMOS MICROCONTROLLERS WITH NANOWATT TECHNOLOGY |
发布紧急采购，3分钟左右您将得到回复。