Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller PDIP 20 8-Bit 20 MHz I/O number 17

PIC16F527

DS41652A-page 42 Preliminary  2012 Microchip Technology Inc.

8.2 Register Definitions — Configuration Word

U-1 U-1 R/P-1 R/P-1 R/P-1 R/P-1 R/P-1 R/P-1 R/P-1 R/P-1 R/P-1 R/P-1

— — DRTEN BOREN CPSW IOSCFS MCLRE CP WDTE FOSC2 FOSC1 FOSC0

bit 11 bit 0

Legend:

R = Readable bit P = Programmable bit U = Unimplemented bit, read as ‘1’

‘0’ = Bit is cleared ‘1’ = Bit is set -n = Value when blank or after Bulk Erase

bit 11-10 Unimplemented: Read as ‘1’

bit 9 DRTEN: Device Reset Timer Enable bit

1 =DRT Enabled (18ms)

0 =DRT Disabled

bit 8 BOREN: Brown-out Reset Enable bit

1 = BOR Enabled

0 = BOR Disabled

bit 7 CPSW

: Code Protection bit – Self Writable Memory

1 = Code protection off

0 = Code protection on

bit 6 IOSCFS: Internal Oscillator Frequency Select bit

1 = 8 MHz INTOSC speed

0 = 4 MHz INTOSC speed

bit 5 MCLRE: Master Clear Enable bit

1 =RA3/MCLR pin functions as MCLR

0 =RA3/MCLR pin functions as RA3, MCLR tied internally to VDD

bit 4 CP: Code Protection bit – User Program Memory

1 = Code protection off

0 = Code protection on

bit 3 WDTE: Watchdog Timer Enable bit

1 = WDT enabled

0 = WDT disabled

bit 2-0 FOSC<2:0>: Oscillator Selection bits

000 = LP oscillator and automatic 18 ms DRT (DRTEN fuse ignored)

001 = XT oscillator and automatic 18 ms DRT (DRTEN fuse ignored)

010 = HS oscillator and automatic 18 ms DRT (DRTEN fuse ignored)

011 = EC oscillator with RA4 function on RA4/OSC2/CLKOUT and 10 us start-up time

(2,3)

100 = INTRC with RA4 function on RA4/OSC2/CLKOUT and 10 us start-up time

(2,3)

101 = INTRC with CLKOUT function on RA4/OSC2/CLKOUT and 10 us start-up time

(2,3)

110 = EXTRC with RA4 function on RA4/OSC2/CLKOUT and 10 us start-up time

(2,3)

111 = EXTRC with CLKOUT function on RA4/OSC2/CLKOUT and 10 us start-up time

(2,3)

Note 1: Refer to the “PIC16F527 Memory Programming Specification”, DS41640 to determine how to access the

Configuration Word.

2: DRT length and start-up time are functions of the Clock mode selection. It is the responsibility of the

application designer to ensure the use of either will result in acceptable operation. Refer to Section 15.0

“Electrical Characteristics” for V

DD rise time and stability requirements for this mode of operation.

3: The optional DRTEN fuse can be used to extend the start-up time to 18 ms.