參數(shù)資料
型號： PIC16F77
廠商： Microchip Technology Inc.
英文描述： 40-Pin 8-Bit CMOS FLASH Microcontrollers(40腳、8位CMOS 閃速微控制器)
中文描述： 40引腳8位CMOS閃存微控制器（40腳，8位的CMOS閃速微控制器）
文件頁數(shù)： 98/170頁
文件大?。?/td> 3150K
代理商： PIC16F77
PIC16F7X
DS30325A-page 98
Advance Information
2000 Microchip Technology Inc.
TABLE 12-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
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 (R
EXT
) and capacitor (C
EXT
) values, and the operat-
ing temperature. In addition to this, the oscillator
frequency will vary from unit to unit due to normal pro-
cess parameter variation. Furthermore, the difference
in lead frame capacitance between package types will
also affect the oscillation frequency, especially for low
C
EXT
values. The user also needs to take into account
variation due to tolerance of external R and C compo-
nents used. Figure 12-3 shows how the R/C combina-
tion is connected to the PIC16F7X.
FIGURE 12-3: RC OSCILLATOR MODE
Osc Type
Crystal
Freq
Cap. Range
C1
Cap.
Range
C2
LP
32 kHz
200 kHz
200 kHz
1 MHz
4 MHz
4 MHz
8 MHz
20 MHz
33 pF
15 pF
47-68 pF
15 pF
15 pF
15 pF
15-33 pF
15-33 pF
33 pF
15 pF
47-68 pF
15 pF
15 pF
15 pF
15-33 pF
15-33 pF
XT
HS
These values are for design guidance only.
See notes at bottom of page.
Crystals Used
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
32 kHz
± 20 PPM
± 20 PPM
± 50 PPM
± 50 PPM
± 30 PPM
± 30 PPM
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:
When migrating from other PICmicro
devices, oscillator performance should be
verified.
OSC2/CLKOUT
C
EXT
R
EXT
PIC16F7X
OSC1
F
OSC
/4
Internal
Clock
V
DD
V
SS
Recommended values:
3 k
≤
R
EXT
≤
100 k
C
EXT
> 20pF
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