PIC16F819 Microchip Technology Inc., PIC16F819 Datasheet - Page 40

• Manufacturer Part Number: PIC16F819
• Description: 18/20-pin Enhanced Flash Microcontrollers With Nanowatt Technology
• Manufacturer: Microchip Technology Inc.

PIC16F818/819
FIGURE 4-6:
REGISTER 4-2:
DS39598E-page 38
OSC2
OSC1
bit 7
bit 6-4
bit 3
bit 2
bit 1-0
31.25 kHz
PIC16F818/819 CLOCK DIAGRAM
OSCCON: OSCILLATOR CONTROL REGISTER (ADDRESS 8Fh)
(INTRC)
bit 7
Unimplemented: Read as ‘0’
IRCF2:IRCF0: Internal Oscillator Frequency Select bits
111 = 8 MHz (8 MHz source drives clock directly)
110 = 4 MHz
101 = 2 MHz
100 = 1 MHz
011 = 500 kHz
010 = 250 kHz
001 = 125 kHz
000 = 31.25 kHz (INTRC source drives clock directly)
Unimplemented: Read as ‘0’
IOFS: INTOSC Frequency Stable bit
1 = Frequency is stable
0 = Frequency is not stable
Unimplemented: Read as ‘0’
Legend:
R = Readable bit
-n = Value at POR
U-0
31.25 kHz
—
Oscillator
Internal
Source
Block
Sleep
IRCF2
R/W-0
(INTOSC)
8 MHz
R/W-0
IRCF1
PIC18F818/819
W = Writable bit
‘1’ = Bit is set
31.25 kHz
500 kHz
250 kHz
125 kHz
8 MHz
4 MHz
2 MHz
1 MHz
OSCCON<6:4>
R/W-0
IRCF0
111
110
101
100
011
010
001
000
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U-0
—
LP, XT, HS, RC, EC
Internal Oscillator
CONFIG (FOSC2:FOSC0)
IOFS
R-0
 2004 Microchip Technology Inc.
x = Bit is unknown
U-0
—
WDT
Peripherals
CPU
U-0
—
bit 0