PIC16HV540 Microchip Technology, PIC16HV540 Datasheet - Page 32

• Manufacturer Part Number: PIC16HV540
• Description: Enhanced PIC16C54 EPROM-Based 8-Bit CMOS Microcontroller
• Manufacturer: Microchip Technology

PIC16HV540
7.2
7.2.1
The PIC16HV540 can be operated in four different
oscillator modes. The user can program two configura-
tion bits (FOSC1:FOSC0) to select one of these four
modes:
• LP:
• XT:
• HS:
• RC:
7.2.2
In XT, LP or HS modes, a crystal or ceramic resonator
is connected to the OSC1/CLKIN and OSC2/CLKOUT
pins
PIC16HV540 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 specifica-
tions. When in XT, LP or HS modes, the device can
have an external clock source drive the OSC1/CLKIN
pin (Figure 7-2).
FIGURE 7-1:
DS40197B-page 32
Note 1:
Note:
to
2: A series resistor (RS) may be required for AT
3: RF varies with the crystal chosen (approx.
C2
C1
Oscillator Configurations
CRYSTAL OSCILLATOR / CERAMIC
RESONATORS
OSCILLATOR TYPES
(1)
(1)
See Capacitor Selection tables for
recommended values of C1 and C2.
strip cut crystals.
value = 10 M ).
Low Power Crystal
Crystal/Resonator
High Speed Crystal/Resonator
Resistor/Capacitor
Not all oscillator selections available for all
parts. See Section 7.1.
establish
RS
XTAL
(2)
CRYSTAL OPERATION
(OR CERAMIC RESONATOR)
(HS, XT OR LP OSC
CONFIGURATION)
OSC2
OSC1
oscillation
RF
(3)
(Figure 7-1).
PIC16HV540
To internal
SLEEP
logic
The
Preliminary
FIGURE 7-2:
TABLE 7-1:
TABLE 7-2:
Note 1: For V
Clock from
ext. system
Note:
Note:
Type
Type
Osc
Osc
XT
HS
XT
HS
LP
2: These values are for design guidance only.
recommended.
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.
Resonator
Resonator
These values are for design guidance only.
Since each resonator has its own charac-
teristics, the user should consult the reso-
nator manufacturer for appropriate values
of external components.
If you change from this device to another
device, please verify oscillator characteris-
tics in your application.
16.0 MHz
32 kHz
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
100 kHz
200 kHz
455 kHz
20 MHz
1 MHz
2 MHz
4 MHz
4 MHz
8 MHz
Open
Freq
Freq
DD
EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR LP
OSC CONFIGURATION)
CAPACITOR SELECTION
FOR CERAMIC RESONATORS
- PIC16HV540
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
- PIC16HV540
> 4.5V, C1 = C2
(1)
Cap. Range
Cap.Range
68-100 pF
2000 Microchip Technology Inc.
15-33 pF
10-22 pF
10-22 pF
15-30 pF
15-30 pF
15-30 pF
15-30 pF
10 pF
15 pF
15 pF
15 pF
15 pF
15 pF
15 pF
OSC2
OSC1
C1
C1
PIC16HV540
30 pF is
Cap. Range
Cap. Range
200-300 pF
100-200 pF
68-100 pF
15-100 pF
15-33 pF
10-22 pF
10-22 pF
15-30 pF
10 pF
15 pF
15 pF
15 pF
15 pF
15 pF
15 pF
C2
C2