MCP1726T-ADJZEMF Microchip Technology, MCP1726T-ADJZEMF Datasheet - Page 21

• Manufacturer Part Number: MCP1726T-ADJZEMF
• Description: Regulator, Extended Industrial, HVSON, 8-Pin|
• Manufacturer: Microchip Technology

3.0
3.1
The PIC12F683 can be operated in eight different
oscillator modes. The user can program three
configuration bits (FOSC2:FOSC0) to select one of
these eight modes:
1.
2.
3.
4.
5.
6.
7.
8.
3.2
In XT, LP or HS modes, a crystal or ceramic resonator
is connected to the OSC1/CLKI and OSC2/CLKO pins
to establish oscillation (see Figure 3-1 and Figure 3-2).
The PIC12F683 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.
FIGURE 3-1:
 2003 Microchip Technology Inc.
Note 1: See Table 3-1 for typical values of C1 and
LP - Low-power Crystal
XT - Crystal/Resonator
HS - High-speed Crystal/Resonator
RC - External Resistor/Capacitor with F
output on GP4
RCIO - External Resistor/Capacitor with I/O on
GP4
INTOSC - Internal Oscillator with F
on GP4 and I/O on GP5
INTOSCIO - Internal Oscillator with I/O on GP4
and GP5
EC - External Clock with I/O on GP4
C1
C2
OSCILLATOR
CONFIGURATIONS
Oscillator Types
Crystal Oscillator/Ceramic
Resonators
2: A series resistor (R
3: R
(1)
(1)
C2.
strip cut crystals.
between 2 M
F
XTAL
R
S (2)
varies with the crystal chosen (typically
OSC1
OSC2
CRYSTAL OPERATION
(HS, XT, OR LP OSC.
CONFIGURATION)
to 10 M
R
S
F
) may be required for AT
(3)
.
PIC12F683
OSC
To Internal
Logic
Sleep
/4 output
Advance Information
OSC
/4
TABLE 3-1:
Capacitor values are for design guidance only.
Different capacitor values may be required to produce
acceptable oscillator operation. The user should test
the performance of the oscillator over the expected
V
See the notes following this table for additional
information.
DD
Note 1: Higher capacitance increases the stability
Type
Osc.
HS
LP
XT
and temperature range for the application.
2: Since each crystal has its own character-
3: Rs may be required in HS mode, as well
4: Always verify oscillator performance over
of oscillator, but also increases the
start-up time.
istics, the user should consult the crystal
manufacturer for appropriate values of
external components.
as XT mode, to avoid overdriving crystals
with low drive level specification.
the V
expected for the application.
200 kHz
20 MHz
Crystal
32 kHz
1 MHz
4 MHz
4 MHz
8 MHz
Freq.
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
(FOR DESIGN GUIDANCE
ONLY)
DD
and temperature range that is
PIC12F683
Typical Capacitor Values
33 pF
56 pF
15 pF
15 pF
15 pF
15 pF
15 pF
C1
DS41211A-page 19
Tested
33 pF
56 pF
15 pF
15 pF
15 pF
15 pF
15 pF
C2