參數(shù)資料
型號： PIC16CR74-I/L
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 167/172頁
文件大?。?/td> 2964K
代理商： PIC16CR74-I/L
PIC16CR7X
DS21993C-page 92
2007 Microchip Technology Inc.
TABLE 12-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
(FOR DESIGN GUIDANCE
ONLY)
12.2.3
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 resis-
tor (REXT) and capacitor (CEXT) values, and the operat-
ing temperature. In addition to this, the oscillator
frequency will vary from unit to unit due to normal
process parameter variation. Furthermore, the differ-
ence 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 12-3 shows how the
R/C combination is connected to the PIC16CR7X.
FIGURE 12-3:
RC OSCILLATOR MODE
Osc Type
Crystal
Freq.
Typical Capacitor Values
Tested:
C1
C2
LP
32 kHz
33 pF
200 kHz
15 pF
XT
200 kHz
56 pF
1 MHz
15 pF
4 MHz
15 pF
HS
4 MHz
15 pF
8 MHz
15 pF
20 MHz
15 pF
Capacitor values are for design guidance only.
These capacitors were tested with the crystals listed
below for basic start-up and operation. These values
were not optimized.
Different capacitor values may be required to produce
acceptable oscillator operation. The user should test
the performance of the oscillator over the expected
VDD and temperature range for the application.
See the notes following this table for additional
information.
Crystals Used:
32 kHz
Epson C-001R32.768K-A
200 kHz
STD XTL 200.000KHz
1 MHz
ECS ECS-10-13-1
4 MHz
ECS ECS-40-20-1
8 MHz
EPSON CA-301 8.000M-C
20 MHz
EPSON CA-301 20.000M-C
Note 1: Higher capacitance increases the stability
of oscillator, but also increases the start-
up time.
2: Since each resonator/crystal has its own
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate values of external compo-
nents.
3: Rs may be required in HS mode, as well
as XT mode, to avoid overdriving crystals
with low drive level specification.
4: Always verify oscillator performance over
the VDD and temperature range that is
expected for the application.
OSC2/CLKOUT
CEXT
REXT
PIC16CR7X
OSC1
FOSC/4
Internal
Clock
VDD
VSS
Recommended values:
3 k
Ω ≤ REXT ≤ 100 kΩ
CEXT > 20pF
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PIC16F1934T-E/P 8-BIT, FLASH, 32 MHz, RISC MICROCONTROLLER, PDIP40
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