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PIC18F4520E/MLQTP Datasheet(PDF) 252 Page - Microchip Technology

Part # PIC18F4520E/MLQTP
Description  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  390 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4520E/MLQTP Datasheet(HTML) 252 Page - Microchip Technology

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PIC18F2420/2520/4420/4520
DS39631A-page 250
Preliminary
 2004 Microchip Technology Inc.
REGISTER 23-1:
CONFIG1H: CONFIGURATION REGISTER 1 HIGH (BYTE ADDRESS 300001h)
R/P-0
R/P-0
U-0
U-0
R/P-0
R/P-1
R/P-1
R/P-1
IESO
FCMEN
—
—
FOSC3
FOSC2
FOSC1
FOSC0
bit 7
bit 0
bit 7
IESO: Internal/External Oscillator Switchover bit
1
= Oscillator Switchover mode enabled
0
= Oscillator Switchover mode disabled
bit 6
FCMEN: Fail-Safe Clock Monitor Enable bit
1
= Fail-Safe Clock Monitor enabled
0
= Fail-Safe Clock Monitor disabled
bit 5-4
Unimplemented: Read as ‘0’
bit 3-0
FOSC3:FOSC0: Oscillator Selection bits
11xx
= External RC oscillator, CLKO function on RA6
101x
= External RC oscillator, CLKO function on RA6
1001
= Internal oscillator block, CLKO function on RA6, port function on RA7
1000
= Internal oscillator block, port function on RA6 and RA7
0111
= External RC oscillator, port function on RA6
0110
= HS oscillator, PLL enabled (Clock Frequency = 4 x FOSC1)
0101
= EC oscillator, port function on RA6
0100
= EC oscillator, CLKO function on RA6
0011
= External RC oscillator, CLKO function on RA6
0010
= HS oscillator
0001
= XT oscillator
0000
= LP oscillator
Legend:
R = Readable bit
P = Programmable bit
U = Unimplemented bit, read as ‘0’
-n = Value when device is unprogrammed
u = Unchanged from programmed state



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