PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 101

• Manufacturer Part Number: PIC17C42
• Description: High-Performance 8-Bit CMOS EPROM/ROM Microcontroller
• Manufacturer: Microchip Technology

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