Microchip Technology DM163025-1 데이터 시트
PIC18(L)F2X/45K50
DS30684A-page 388
2012 Microchip Technology Inc.
REGISTER 26-2:
CONFIG1H: CONFIGURATION REGISTER 1 HIGH
R/P-0
R/P-0
R/P-1
U-0
R/P-0
R/P-1
R/P-0
R/P-1
IESO
FCMEN
PCLKEN
—
FOSC<3:0>
bit 7
bit 0
Legend:
R = Readable bit
R = Readable bit
P = Programmable bit
U = Unimplemented bit, read as ‘0’
-n = Value when device is unprogrammed
x = Bit is unknown
bit 7
IESO
(1)
:
Internal/External Oscillator Switchover bit
1
= Oscillator Switchover mode enabled
0
= Oscillator Switchover mode disabled
bit 6
FCMEN
(1)
:
Fail-Safe Clock Monitor Enable bit
1
= Fail-Safe Clock Monitor enabled
0
= Fail-Safe Clock Monitor disabled
bit 5
PCLKEN:
Primary Clock Enable bit
1
= Primary Clock is always enabled
0
= Primary Clock can be disabled by software
bit 4
Unimplemented:
Read as ‘0’
bit 3-0
FOSC<3:0>:
Oscillator Selection bits
1111
= Reserved
1110
= Reserved
1101
= EC oscillator (low power, <4 MHz)
1100
= EC oscillator, CLKO function on OSC2 (low power, <4 MHz)
1011
= EC oscillator (medium power, 4 MHz - 16 MHz)
1010
= EC oscillator, CLKO function on OSC2 (medium power, 4 MHz - 16 MHz)
1001
= Internal oscillator block, CLKO function on OSC2
1000
= Internal oscillator block
0111
= External RC oscillator
0110
= External RC oscillator, CLKO function on OSC2
0101
= EC oscillator (high power, 16 MHz - 48 MHz)
0100
= EC oscillator, CLKO function on OSC2 (high power, 16 MHz - 48 MHz)
0011
= HS oscillator (medium power, 4 MHz - 16 MHz)
0010
= HS oscillator (high power, 16 MHz - 25 MHz)
0001
= XT oscillator
0000
= LP oscillator
Note 1:
When FOSC<3:0> is configured for HS, XT, or LP oscillator and FCMEN bit is set, then the IESO bit
should also be set to prevent a false failed clock indication and to enable automatic clock switch over from
the internal oscillator block to the external oscillator when the OST times out.
should also be set to prevent a false failed clock indication and to enable automatic clock switch over from
the internal oscillator block to the external oscillator when the OST times out.