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| 型號(hào)： | PIC12F519-I/SN |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 37/96頁 |
| 文件大小： | 0K |
| 描述： | IC PIC MCU FLASH 1KX12 8SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Asynchronous Stimulus 8-bit PIC® Microcontroller Portfolio |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 系列： | PIC® 12F |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 8MHz |
| 外圍設(shè)備： | POR，WDT |
| 輸入/輸出數(shù)： | 5 |
| 程序存儲(chǔ)器容量： | 1.5KB（1K x 12） |
| 程序存儲(chǔ)器類型： | 閃存 |
| RAM 容量： | 41 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 637 (CN2011-ZH PDF) |
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PIC12F519
DS41319B-page 40
2008 Microchip Technology Inc.
8.2.3
EXTERNAL CRYSTAL OSCILLATOR
CIRCUIT
Either a prepackaged oscillator or a simple oscillator
circuit with TTL gates can be used as an external
crystal oscillator circuit. Prepackaged oscillators provide
a wide operating range and better stability. A
well-designed crystal oscillator will provide good
performance with TTL gates. Two types of crystal
oscillator circuits can be used: one with parallel
resonance, or one with series resonance.
Figure 8-3 shows implementation of a parallel resonant
oscillator circuit. The circuit is designed to use the
fundamental frequency of the crystal. The 74AS04
inverter performs the 180-degree phase shift that a
parallel oscillator requires. The 4.7 k
Ω resistor provides
the negative feedback for stability. The 10 k
Ω
potentiometers bias the 74AS04 in the linear region.
This circuit could be used for external oscillator designs.
FIGURE 8-3:
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
Figure 8-4 shows a series resonant oscillator circuit.
This circuit is also designed to use the fundamental
frequency of the crystal. The inverter performs a
180-degree phase shift in a series resonant oscillator
circuit. The 330
Ω resistors provide the negative
feedback to bias the inverters in their linear region.
FIGURE 8-4:
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
8.2.4
EXTERNAL RC OSCILLATOR
For timing insensitive applications, the RC circuit option
offers additional cost savings. 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
process
parameter
variation.
Furthermore,
the
difference in lead frame capacitance between package
types will also affect the oscillation frequency, especially
for low CEXT values. The user also needs to take into
account variation due to tolerance of external R and C
components used.
Figure 8-5 shows how the R/C combination is
connected to the PIC12F519 device. For REXT values
below 3.0 k
Ω, the oscillator operation may become
unstable, or stop completely. For very high REXT values
(e.g., 1 M
Ω), the oscillator becomes sensitive to noise,
humidity and leakage. It is recommended keeping REXT
between 5.0 k
Ω and 100 kΩ.
Although the oscillator will operate with no external
capacitor (CEXT = 0 pF), it is recommended using
values above 20 pF for noise and stability reasons. With
no or small external capacitance, the oscillation
frequency can vary dramatically due to changes in
external capacitances, such as PCB trace capacitance
or package lead frame capacitance. See Figure 11-1
and Figure 11-2.
FIGURE 8-5:
EXTERNAL RC
OSCILLATOR MODE
8.2.5
INTERNAL 4/8 MHz RC
OSCILLATOR
The internal RC oscillator provides a fixed 4/8 MHz
(nominal) system clock at VDD = 3.5V and 25°C, (see
for
information on variation over voltage and temperature).
In addition, a calibration instruction is programmed into
the last address of memory, which contains the
calibration value for the internal RC oscillator. This
location is always non-code protected, regardless of the
code-protect settings. This value is programmed as a
MOVLW XX
instruction where XX is the calibration value,
and is placed at the Reset vector. This will load the W
register with the calibration value upon Reset and the
20 pF
+5V
20 pF
10k
4.7k
10k
74AS04
XTAL
10k
74AS04
PIC12F519
CLKIN
To Other
Devices
330
74AS04
CLKIN
To Other
Devices
XTAL
330
74AS04
0.1 mF
PIC12F519
VDD
REXT
CEXT
VSS
OSC1
Internal
clock
PIC16F519
N
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC12F519T-E/MC | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin, 8-Bit Flash Microcontroller |
| PIC12F519T-E/MS | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin, 8-Bit Flash Microcontroller |
| PIC12F519T-E/P | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:8-Pin, 8-Bit Flash Microcontroller |
| PIC12F519T-E/SN | 制造商:Microchip Technology Inc 功能描述:8-PIN, 1.5KB FLASH PROGRAM, 64 - Tape and Reel |
| PIC12F519T-I/MC | 功能描述:8位微控制器 -MCU 15KB Flash Prgrm 64B 8MHz Intrnl Oscilatr 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(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 |
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