PIC16F818_13 Datasheet, PDF (38/178 Pages) Microchip Technology – 18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Technology

PIC16F818/819
FIGURE 4-6:
OSC2
OSC1
PIC16F818/819 CLOCK DIAGRAM
PIC18F818/819
CONFIG (FOSC2:FOSC0)
Sleep
Internal
Oscillator
Block
31.25 kHz
Source
8 MHz
(INTOSC)
31.25 kHz
(INTRC)
LP, XT, HS, RC, EC
OSCCON<6:4>
8 MHz
111
4 MHz
110
2 MHz
101
1 MHz
100
500 kHz
011
250 kHz
010
125 kHz
001
31.25 kHz
000
Internal Oscillator
Peripherals
CPU
WDT
REGISTER 4-2:
OSCCON: OSCILLATOR CONTROL REGISTER (ADDRESS 8Fh)
U-0
R/W-0 R/W-0 R/W-0
U-0
R-0
U-0
—
IRCF2 IRCF1 IRCF0
—
IOFS
—
bit 7
U-0
—
bit 0
bit 7
bit 6-4
bit 3
bit 2
bit 1-0
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
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
DS39598F-page 38
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