PIC16F1938 Datasheet, PDF (77/452 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers

PIC16(L)F1938/9
5.6 Oscillator Control Registers
REGISTER 5-1: OSCCON: OSCILLATOR CONTROL REGISTER
R/W-0/0
R/W-0/0
R/W-1/1
R/W-1/1
R/W-1/1
U-0
SPLLEN
IRCF<3:0>
—
bit 7
R/W-0/0
R/W-0/0
SCS<1:0>
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
bit 6-3
bit 2
bit 1-0
SPLLEN: Software PLL Enable bit
If PLLEN in Configuration Word 1 = 1:
SPLLEN bit is ignored. 4x PLL is always enabled (subject to oscillator requirements)
If PLLEN in Configuration Word 1 = 0:
1 = 4x PLL Is enabled
0 = 4x PLL is disabled
IRCF<3:0>: Internal Oscillator Frequency Select bits
000x = 31 kHz LF
0010 = 31.25 kHz MF
0011 = 31.25 kHz HF⁽¹⁾
0100 = 62.5 kHz MF
0101 = 125 kHz MF
0110 = 250 kHz MF
0111 = 500 kHz MF (default upon Reset)
1000 = 125 kHz HF⁽¹⁾
1001 = 250 kHz HF⁽¹⁾
1010 = 500 kHz HF⁽¹⁾
1011 = 1 MHz HF
1100 = 2 MHz HF
1101 = 4 MHz HF
1110 = 8 MHz or 32 MHz HF(see Section 5.2.2.1 “HFINTOSC”)
1111 = 16 MHz HF
Unimplemented: Read as ‘0’
SCS<1:0>: System Clock Select bits
1x = Internal oscillator block
01 = Timer1 oscillator
00 = Clock determined by FOSC<2:0> in Configuration Word 1.
Note 1: Duplicate frequency derived from HFINTOSC.
 2011 Microchip Technology Inc.
Preliminary
DS41574A-page 77