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PIC12CE67X 데이터시트(PDF) 46 Page - Microchip Technology

부품명 PIC12CE67X
상세설명  8-Pin, 8-Bit CMOS Microcontroller with A/D Converter and EEPROM Data Memory
PDF  116 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC12CE67X 데이터시트(HTML) 46 Page - Microchip Technology

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PIC12CE67X
DS40181B-page 46
Preliminary
© 1998 Microchip Technology Inc.
9.2
Oscillator Configurations
9.2.1
OSCILLATOR TYPES
The PIC12CE67X can be operated in seven different
oscillator
modes. The
user
can
program
three
configuration bits (FOSC2:FOSC0) to select one of
these seven modes:
• LP:
Low Power Crystal
• HS:
High Speed Crystal Resonator
• XT:
Crystal/Resonator
• INTRC*:
Internal 4 MHz Oscillator
• EXTRC*: External Resistor/Capacitor
*Can be configured to support CLKOUT
9.2.2
CRYSTAL OSCILLATOR / CERAMIC
RESONATORS
In XT, HS or LP modes, a crystal or ceramic resonator
is connected to the GP5/OSC1/CLKIN and GP4/OSC2
pins
to
establish
oscillation
(Figure 9-2).
The
PIC12CE67X oscillator design requires the use of a
parallel cut crystal. Use of a series cut crystal may give
a
frequency
out
of
the
crystal
manufacturers
specifications. When in XT, HS or LP modes, the
device can have an external clock source drive the
GP5/OSC1/CLKIN pin (Figure 9-3).
FIGURE 9-2:
CRYSTAL OPERATION
(OR CERAMIC RESONATOR)
(XT, HS OR LP OSC
CONFIGURATION)
FIGURE 9-3:
EXTERNAL CLOCK INPUT
OPERATION (XT, HS OR LP
OSC CONFIGURATION)
Note 1: See Capacitor Selection tables for
recommended values of C1 and C2.
2: A series resistor (RS) may be required for
AT strip cut crystals.
3: RF varies with the crystal chosen
(approx. value = 10 M
Ω).
C1(1)
C2(1)
XTAL
OSC2
OSC1
RF(3)
SLEEP
To internal
logic
RS(2)
PIC12CE67X
Clock from
ext. system
OSC1
OSC2
PIC12CE67X
Open
TABLE 9-1:
CAPACITOR SELECTION
FOR CERAMIC RESONATORS
- PIC12CE67X
TABLE 9-2:
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
- PIC12CE67X
Osc
Type
Resonator
Freq
Cap. Range
C1
Cap. Range
C2
XT
455 kHz
2.0 MHz
4.0 MHz
22-100 pF
15-68 pF
15-68 pF
22-100 pF
15-68 pF
15-68 pF
HS
4.0 MHz
8.0 MHz
10.0 MHz
15-68 pF
10-68 pF
10-22 pF
15-68 pF
10-68 pF
10-22 pF
These values are for design guidance only. Since
each resonator has its own characteristics, the user
should consult the resonator manufacturer for
appropriate values of external components.
Osc
Type
Resonator
Freq
Cap.Range
C1
Cap. Range
C2
LP
32 kHz(1)
100 kHz
200 kHz
15 pF
15-30 pF
15-30 pF
15 pF
30-47 pF
15-82 pF
XT
100 kHz
200 kHz
455 kHz
1 MHz
2 MHz
4 MHz
15-30 pF
15-30 pF
15-30 pF
15-30 pF
15-30 pF
15-47 pF
200-300 pF
100-200 pF
15-100 pF
15-30 pF
15-30 pF
15-47 pF
HS
4 MHz
8 MHz
10 MHz
15-30 pF
15-30 pF
15-30 pF
15-30 pF
15-30 pF
15-30 pF
Note 1: For VDD > 4.5V, C1 = C2
≈ 30 pF is
recommended.
These values are for design guidance only. Rs may
be required in HS mode as well as XT mode to avoid
overdriving crystals with low drive level specification.
Since each crystal has its own characteristics, the
user should consult the crystal manufacturer for
appropriate values of external components.



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