PIC16F8X_13 Datasheet, PDF (39/128 Pages) Microchip Technology – 18-pin Flash/EEPROM 8-Bit Microcontrollers

PIC16F8X
FIGURE 8-2: CONFIGURATION WORD - PIC16F83 AND PIC16F84
R/P-u R/P-u R/P-u R/P-u R/P-u R/P-u R/P-u
CP CP CP CP CP CP CP
bit13
bit 13:4 CP: Code Protection bit
1 = Code protection off
0 = All memory is code protected
R/P-u
CP
R/P-u
CP
R/P-u
CP
R/P-u
PWRTE
R/P-u R/P-u R/P-u
WDTE FOSC1 FOSC0
bit0
R = Readable bit
P = Programmable bit
- n = Value at POR reset
u = unchanged
bit 3 PWRTE: Power-up Timer Enable bit
1 = Power-up timer is disabled
0 = Power-up timer is enabled
bit 2 WDTE: Watchdog Timer Enable bit
1 = WDT enabled
0 = WDT disabled
bit 1:0
FOSC1:FOSC0: Oscillator Selection bits
11 = RC oscillator
10 = HS oscillator
01 = XT oscillator
00 = LP oscillator
8.2 Oscillator Configurations
8.2.1 OSCILLATOR TYPES
The PIC16F8X can be operated in four different
oscillator modes. The user can program two
configuration bits (FOSC1 and FOSC0) to select one of
these four modes:
• LP
• XT
• HS
• RC
Low Power Crystal
Crystal/Resonator
High Speed Crystal/Resonator
Resistor/Capacitor
8.2.2 CRYSTAL OSCILLATOR / CERAMIC
RESONATORS
In XT, LP or HS modes a crystal or ceramic resonator
is connected to the OSC1/CLKIN and OSC2/CLKOUT
pins to establish oscillation (Figure 8-3).
FIGURE 8-3:
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP OSC
CONFIGURATION)
C1⁽¹⁾
OSC1
XTAL
OSC2
RS⁽²⁾
C2⁽¹⁾
RF⁽³⁾
To
internal
logic
SLEEP
PIC16FXX
Note1:
2:
3:
See Table 8-1 for recommended values of
C1 and C2.
A series resistor (RS) may be required for
AT strip cut crystals.
RF varies with the crystal chosen.
The PIC16F8X 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, LP or HS modes, the device
can have an external clock source to drive the
OSC1/CLKIN pin (Figure 8-4).
 1996-2013 Microchip Technology Inc.
DS30430D-page 39