參數(shù)資料
型號(hào)： 35007B
廠商： Microchip Technology Inc.
英文描述： 18-pin Enhanced FLASH/EEPROM 8-bit Microcontroller
中文描述： 18針/ EEPROM的8位微控制器的閃存
文件頁數(shù)： 25/88頁
文件大?。?/td> 1495K
代理商： 35007B
2001 Microchip Technology Inc.
DS35007B-page 23
PIC16F84A
TABLE 6-2:
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
6.2.3
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
resistor (R
EXT
) values, capacitor (C
EXT
) values, and
the operating temperature. In addition to this, the oscil-
lator frequency will vary from unit to unit due to normal
process
parameter
variation.
difference in lead frame capacitance between package
types also affects the oscillation frequency, especially
for low C
EXT
values. The user needs to take into
account variation, due to tolerance of the external
R and C components. Figure 6-3 shows how an R/C
combination is connected to the PIC16F84A.
Furthermore,
the
FIGURE 6-3:
V
DD
RC OSCILLATOR MODE
Mode
LP
Freq
32 kHz
200 kHz
100 kHz
2 MHz
4 MHz
4 MHz
20 MHz
Higher capacitance increases the stability
of the oscillator, but also increases the
start-up time. These values are for design
guidance only. Rs may be required in HS
mode, as well as XT mode, to avoid over-
driving crystals with low drive level specifi-
cation. Since each crystal has its own
characteristics, the user should consult the
crystal
manufacturer
values of external components.
For V
DD
> 4.5V, C1 = C2
≈
30 pF is recom-
mended.
OSC1/C1
68 - 100 pF
15 - 33 pF
100 - 150 pF
15 - 33 pF
15 - 33 pF
15 - 33 pF
15 - 33 pF
OSC2/C2
68 - 100 pF
15 - 33 pF
100 - 150 pF
15 - 33 pF
15 - 33 pF
15 - 33 pF
15 - 33 pF
XT
HS
Note:
for
appropriate
OSC2/CLKOUT
C
EXT
R
EXT
PIC16FXX
OSC1
F
OSC
/4
Internal
Clock
V
SS
Recommended values:
5 k
≤
R
EXT
≤
100 k
C
EXT
> 20pF
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