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1996 Microchip Technology Inc.
DS30412C-page 101
PIC17C4X
FIGURE 14-3: CRYSTAL OPERATION,
OVERTONE CRYSTALS (XT
OSC CONFIGURATION)
TABLE 14-2:
CAPACITOR SELECTION
FOR CERAMIC
RESONATORS
Oscillator
Type
Resonator
Frequency
Capacitor Range
C1 = C2
LF
455 kHz
2.0 MHz
15 - 68 pF
10 - 33 pF
XT
4.0 MHz
8.0 MHz
16.0 MHz
22 - 68 pF
33 - 100 pF
Higher capacitance increases the stability of the
oscillator but also increases the start-up time. These
values are for design guidance only. Since each reso-
nator has its own characteristics, the user should
consult the resonator manufacturer for appropriate
values of external components.
Resonators Used:
455 kHz
Panasonic EFO-A455K04B
± 0.3%
2.0 MHz
Murata Erie CSA2.00MG
± 0.5%
4.0 MHz
Murata Erie CSA4.00MG
± 0.5%
8.0 MHz
Murata Erie CSA8.00MT
± 0.5%
16.0 MHz
Murata Erie CSA16.00MX
± 0.5%
Resonators used did not have built-in capacitors.
C1
C2
0.1
F
SLEEP
OSC2
OSC1
PIC17C42
To lter the fundamental frequency
1
LC2
= (2
πf)2
Where f = tank circuit resonant frequency. This should be
midway between the fundamental and the 3rd overtone
frequencies of the crystal.
TABLE 14-3:
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
14.2.3
EXTERNAL CLOCK OSCILLATOR
In the EC oscillator mode, the OSC1 input can be
driven
by
CMOS
drivers.
In
this
mode,
the
OSC1/CLKIN pin is hi-impedance and the OSC2/CLK-
OUT pin is the CLKOUT output (4 TOSC).
FIGURE 14-4: EXTERNAL CLOCK INPUT
OPERATION (EC OSC
CONFIGURATION)
Osc
Type
Freq
C1
C2
LF
32 kHz(1)
1 MHz
2 MHz
100-150 pF
10-33 pF
100-150 pF
10-33 pF
XT
2 MHz
4 MHz
8 MHz (2)
16 MHz
25 MHz
32 MHz (3)
47-100 pF
15-68 pF
15-47 pF
TBD
15-47 pF
0 (3)
47-100 pF
15-68 pF
15-47 pF
TBD
15-47 pF
0 (3)
Higher capacitance increases the stability of the
oscillator but also increases the start-up time and the
oscillator current. These values are for design guid-
ance only. RS may be required in XT mode to avoid
overdriving the crystals with low drive level specica-
tion. Since each crystal has its own characteristics,
the user should consult the crystal manufacturer for
appropriate values for external components.
Note 1: For VDD > 4.5V, C1 = C2
≈ 30 pF is recom-
mended.
2: RS of 330
is required for a capacitor com-
bination of 15/15 pF.
3:
Only the capacitance of the board was present.
Crystals Used:
32.768 kHz
Epson C-001R32.768K-A
± 20 PPM
1.0 MHz
ECS-10-13-1
± 50 PPM
2.0 MHz
ECS-20-20-1
± 50 PPM
4.0 MHz
ECS-40-20-1
± 50 PPM
8.0 MHz
ECS ECS-80-S-4
ECS-80-18-1
± 50 PPM
16.0 MHz
ECS-160-20-1
TBD
25 MHz
CTS CTS25M
± 50 PPM
32 MHz
CRYSTEK HF-2
± 50 PPM
Clock from
ext. system
OSC1
OSC2
PIC17CXX
CLKOUT
(FOSC/4)
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