参数资料
| 型号： | PIC12C508A-04I/P |
| 厂商： | Microchip Technology |
| 文件页数： | 45/113页 |
| 文件大小： | 0K |
| 描述： | IC MCU OTP 512X12 8DIP |
| 产品培训模块： | Asynchronous Stimulus 8-bit PIC® Microcontroller Portfolio |
| 标准包装： | 60 |
| 系列： | PIC® 12C |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 4MHz |
| 外围设备： | POR，WDT |
| 输入/输出数： | 5 |
| 程序存储器容量： | 768B（512 x 12） |
| 程序存储器类型： | OTP |
| RAM 容量： | 25 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 3 V ~ 5.5 V |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 配用： | ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING DVMCPA-ND - KIT DVR BOARD EVAL SYSTEM MXDEV1 DVA12XP080-ND - ADAPTER DEVICE FOR MPLAB-ICE AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC |
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1999 Microchip Technology Inc.
DS40139E-page 37
PIC12C5XX
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.
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
resistor
provides the negative feedback for stability. The 10 k
potentiometers bias the 74AS04 in the linear region.
This circuit could be used for external oscillator
designs.
FIGURE 8-4:
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
Figure 8-5 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
resistors provide the negative
feedback to bias the inverters in their linear region.
FIGURE 8-5:
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
20 pF
+5V
20 pF
10k
4.7k
10k
74AS04
XTAL
10k
74AS04
CLKIN
To Other
Devices
PIC12C5XX
330
74AS04
CLKIN
To Other
Devices
XTAL
330
74AS04
0.1
F
PIC12C5XX
8.2.4
EXTERNAL RC OSCILLATOR
For timing insensitive applications, the RC device
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.
shows
how
the
R/C
combination
is
connected to the PIC12C5XX. For Rext values below
2.2 k
, the oscillator operation may become unstable,
or stop completely. For very high Rext values
(e.g., 1 M
) the oscillator becomes sensitive to noise,
humidity and leakage. Thus, we recommend keeping
Rext between 3 k
and 100 k.
Although the oscillator will operate with no external
capacitor (Cext = 0 pF), we recommend 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.
The
Electrical
Specifications
sections
show
RC
frequency variation from part to part due to normal
process variation. The variation is larger for larger R
(since
leakage
current
variation
will
affect
RC
frequency more for large R) and for smaller C (since
variation of input capacitance will affect RC frequency
more).
Also, see the Electrical Specifications sections for
variation of oscillator frequency due to VDD for given
Rext/Cext values as well as frequency variation due to
operating temperature for given R, C, and VDD values.
FIGURE 8-6:
EXTERNAL RC OSCILLATOR
MODE
VDD
Rext
Cext
VSS
OSC1
Internal
clock
N
PIC12C5XX
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相关代理商/技术参数 |
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|---|---|
| PIC12C508A-04I-SM | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Errata Sheet for PIC12C508A/509A (Rev. A Silicon) |
| PIC12C508AT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8-Pin, 8-Bit CMOS Microcontrollers |
| PIC12C508AT-04/EJW | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8-Pin, 8-Bit CMOS Microcontrollers |
| PIC12C508AT-04/EP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8-Pin, 8-Bit CMOS Microcontrollers |
| PIC12C508AT-04/ESM | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:8-Pin, 8-Bit CMOS Microcontrollers |
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