PIC16F946 Datasheet, PDF (78/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
FIGURE 4-3:
QUARTZ CRYSTAL
OPERATION (LP, XT OR
HS MODE)
PIC16F946
OSC1
C1
Quartz
Crystal
OSC2
RS⁽¹⁾
C2
RF⁽²⁾
To Int.
Logic
Sleep⁽³⁾
Note 1: A series resistor (RS) may be required for
quartz crystals with low drive level.
2: The value of RF varies with the oscillator
mode selected (typically between 2 MΩ to
10 MΩ).
3: If using LP mode and T1OSC in enable,
the LP oscillator will continue to run during
Sleep.
Note 1: Quartz crystal characteristics vary
according to type, package and manufac-
turer. The user should consult the
manufacturer data sheets for specifica-
tions and recommended application.
2: Always verify oscillator performance over
the VDD and temperature range that is
expected for the application.
FIGURE 4-4:
CERAMIC RESONATOR
OPERATION
(XT OR HS MODE)
OSC1
C1
RF⁽³⁾
OSC2
RS⁽¹⁾
C2 ^Ceramic
Resonator
PIC16F946
RF⁽²⁾
To Int.
Logic
Sleep
Note 1: A series resistor (RS) may be required for
ceramic resonators with low drive level.
2: The value of RF varies with the oscillator
mode selected (typically between 2 MΩ to
10 MΩ).
3: An additional parallel feedback resistor
(RP) may be required for proper ceramic
resonator operation (typical value 1 MΩ).
DS41265A-page 76
Preliminary
© 2005 Microchip Technology Inc.