PIC16F883-ESSQTP datasheet(32/338 Pages) MICROCHIP

32 / 338 page

PIC16F882/883/884/886/887

DS41291G-page 32

 2006-2012 Microchip Technology Inc.

2.2.2.2

OPTION Register

The OPTION register, shown in Register 2-2, is a

readable and writable register, which contains various

control bits to configure:

• Timer0/WDT prescaler

• External INT interrupt

•Timer0

• Weak pull-ups on PORTB

Note:

To achieve a 1:1 prescaler assignment for

Timer0, assign the prescaler to the WDT

by setting PSA bit of the OPTION register

to ‘1’. See Section 6.3 “Timer1 Pres-

caler”.

OPTION_REG: OPTION REGISTER

R/W-1

RBPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

RBPU: PORTB Pull-up Enable bit

1 = PORTB pull-ups are disabled

0 = PORTB pull-ups are enabled by individual PORT latch values

bit 6

INTEDG: Interrupt Edge Select bit

1 = Interrupt on rising edge of INT pin

0 = Interrupt on falling edge of INT pin

bit 5

T0CS: Timer0 Clock Source Select bit

1 = Transition on T0CKI pin

0 = Internal instruction cycle clock (FOSC/4)

bit 4

T0SE: Timer0 Source Edge Select bit

1 = Increment on high-to-low transition on T0CKI pin

0 = Increment on low-to-high transition on T0CKI pin

bit 3

PSA: Prescaler Assignment bit

1 = Prescaler is assigned to the WDT

0 = Prescaler is assigned to the Timer0 module

bit 2-0

PS<2:0>: Prescaler Rate Select bits

000

001

010

011

100

101

110

111

1 : 2

1 : 4

1 : 8

1 : 16

1 : 32

1 : 64

1 : 128

1 : 256

1 : 1

1 : 2

1 : 4

1 : 8

1 : 16

1 : 32

1 : 64

1 : 128

Bit Value

Timer0 Rate WDT Rate

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