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| 型號： | PIC12C672-04I/SM |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 81/129頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU OTP 2KX14 A/D 8-SOIJ |
| 產(chǎn)品培訓(xùn)模塊： | Asynchronous Stimulus 8-bit PIC® Microcontroller Portfolio |
| 標(biāo)準(zhǔn)包裝： | 90 |
| 系列： | PIC® 12C |
| 核心處理器： | PIC |
| 芯體尺寸： | 8-位 |
| 速度： | 4MHz |
| 外圍設(shè)備： | POR，WDT |
| 輸入/輸出數(shù)： | 5 |
| 程序存儲器容量： | 3.5KB（2K x 14） |
| 程序存儲器類型： | OTP |
| RAM 容量： | 128 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 3 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 4x8b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 8-SOIC（0.209"，5.30mm 寬） |
| 包裝： | 管件 |
| 配用： | XLT08SO-1-ND - SOCKET TRANSITION 8SOIC 150/208 AC164312-ND - MODULE SKT FOR PM3 16SOIC ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING 309-1048-ND - ADAPTER 8-SOIC TO 8-DIP 309-1047-ND - ADAPTER 8-SOIC TO 8-DIP AC124001-ND - MODULE SKT PROMATEII 8DIP/SOIC |
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1999 Microchip Technology Inc.
DS30561B-page 55
PIC12C67X
9.2.3
EXTERNAL CRYSTAL OSCILLATOR
CIRCUIT
Either a pre-packaged oscillator or a simple oscillator
circuit with TTL gates can be used as an external
crystal oscillator circuit. Pre-packaged 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 9-3:
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
Figure 9-4 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
resistors provide the negative
feedback to bias the inverters in their linear region.
FIGURE 9-4:
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
20 pF
+5V
20 pF
10k
4.7k
10k
74AS04
XTAL
10k
74AS04
PIC12C67X
CLKIN
To Other
Devices
330
74AS04
PIC12C67X
CLKIN
To Other
Devices
XTAL
330
74AS04
0.1
F
9.2.4
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.
Figure 9-5 shows
how
the
R/C
combination
is
connected to the PIC12C67X. For REXT values below
2.2 k
, the oscillator operation may become unstable
or stop completely. For very high REXT values
(i.e., 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 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).
FIGURE 9-5:
EXTERNAL RC OSCILLATOR
MODE
VDD
REXT
CEXT
VSS
OSC1
Internal
clock
PIC12C67X
N
OSC2/CLKOUT
FOSC/4
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