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PIC17C752 Datasheet

  • PIC17C752

  • High-Performance 8-bit CMOS EPROM Microcontrollers with 10-b...

  • 3053.02KB

  • 304页

  • Microchip   Microchip

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PIC17C75X
FIGURE 4-2:
CRYSTAL OR CERAMIC
RESONATOR OPERATION (XT
OR LF OSC CONFIGURATION)
OSC1
C1
XTAL
OSC2
Note1
C2
PIC17CXXX
To internal
logic
0.1
碌F
PIC17CXXX
RF
SLEEP
C2
OSC2
SLEEP
FIGURE 4-3:
CRYSTAL OPERATION,
OVERTONE CRYSTALS (XT
OSC CONFIGURATION)
OSC1
C1
See Table 4-1 and Table 4-2 for recommended values of
C1 and C2.
Note 1: A series resistor (Rs) may be required for
AT strip cut crystals.
To 铿乴ter the fundamental frequency
1 =
(2蟺f)
2
LC2
Where f = tank circuit resonant frequency. This should be
midway between the fundamental and the 3rd overtone
frequencies of the crystal.
TABLE 4-1:
CAPACITOR SELECTION
FOR CERAMIC
RESONATORS
Resonator
Frequency
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
16.0 MHz
Capacitor Range
C1 = C2
(1)
15 - 68 pF
10 - 33 pF
22 - 68 pF
33 - 100 pF
33 - 100 pF
TABLE 4-2:
Osc
Type
LF
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
Freq
C1
(3)
100-150 pF
10-33 pF
10-33 pF
47-100 pF
15-68 pF
15-47 pF
TBD
15-47 pF
10
C2
(3)
100-150 pF
10-33 pF
10-33 pF
47-100 pF
15-68 pF
15-47 pF
TBD
15-47 pF
10
Oscillator
Type
LF
XT
XT
Higher capacitance increases the stability of the oscillator
but also increases the start-up time. These values are for
design guidance only. Since each resonator has its own
characteristics, the user should consult the resonator manu-
facturer for appropriate values of external components.
32 kHz
(1)
1 MHz
2 MHz
2 MHz
4 MHz
8 MHz
(2)
16 MHz
25 MHz
32 MHz
(3)
Note 1: These values include all board capaci-
tances on this pin. Actual capacitor value
depends on board capacitance
Resonators Used:
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
16.0 MHz
Panasonic EFO-A455K04B
Murata Erie CSA2.00MG
Murata Erie CSA4.00MG
Murata Erie CSA8.00MT
Murata Erie CSA16.00MX
卤
0.3%
卤
0.5%
卤
0.5%
卤
0.5%
卤
0.5%
Higher capacitance increases the stability of the oscillator
but also increases the start-up time and the oscillator cur-
rent. These values are for design guidance only. R
S
may be
required in XT mode to avoid overdriving the crystals with
low drive level speci铿乧ation. Since each crystal has its own
characteristics, the user should consult the crystal manufac-
turer for appropriate values for external components.
Resonators used did not have built-in capacitors.
Crystals Used:
32.768 kHz
1.0 MHz
2.0 MHz
4.0 MHz
8.0 MHz
16.0 MHz
25 MHz
32 MHz
Note 1: For V
DD
> 4.5V, C1 = C2
鈮?/div>
30 pF is recom-
mended.
2: R
S
of 330鈩?is required for a capacitor com-
bination of 15/15 pF.
3: These values include all board capaci-
tances on this pin. Actual capacitor value
depends on board capacitance
Epson C-001R32.768K-A
ECS-10-13-1
ECS-20-20-1
ECS-40-20-1
ECS ECS-80-S-4
ECS-80-18-1
ECS-160-20-1
CTS CTS25M
CRYSTEK HF-2
卤
20 PPM
卤
50 PPM
卤
50 PPM
卤
50 PPM
卤
50 PPM
TBD
卤
50 PPM
卤
50 PPM
DS30264A-page 16
Preliminary
漏
1997 Microchip Technology Inc.

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