PIC18LF4420T-I/SO 查看數據表（PDF） - Microchip Technology

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PIC18LF4420T-I/SO

28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2420/2520/4420/4520

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

bit 6

bit 5-4

bit 3-0

IESO: Internal/External Oscillator Switchover bit

1 = Oscillator Switchover mode enabled

0 = Oscillator Switchover mode disabled

FCMEN: Fail-Safe Clock Monitor Enable bit

1 = Fail-Safe Clock Monitor enabled

0 = Fail-Safe Clock Monitor disabled

Unimplemented: Read as ‘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

-n = Value when device is unprogrammed

U = Unimplemented bit, read as ‘0’

u = Unchanged from programmed state

DS39631A-page 250

Preliminary

 2004 Microchip Technology Inc.

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