PIC16F676-ESLASHST datasheet(14/132 Pages) MICROCHIP

14 / 132 page

PIC16F630/676

DS40039F-page 14

 2010 Microchip Technology Inc.

2.2.2.2

OPTION Register

The OPTION register is a readable and writable

configure:

• TMR0/WDT prescaler

• External RA2/INT interrupt

•TMR0

• Weak pull-ups on PORTA

OPTION_REG — OPTION REGISTER (ADDRESS: 81h)

Note:

To achieve a 1:1 prescaler assignment for

TMR0, assign the prescaler to the WDT by

setting PSA bit to ‘1’ (OPTION<3>). See

Section 4.4 “Prescaler”.

R/W-1

RAPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

bit 7

bit 0

bit 7

RAPU: PORTA Pull-up Enable bit

1 = PORTA pull-ups are disabled

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

bit 6

INTEDG: Interrupt Edge Select bit

1 = Interrupt on rising edge of RA2/INT pin

0 = Interrupt on falling edge of RA2/INT pin

bit 5

T0CS: TMR0 Clock Source Select bit

1 = Transition on RA2/T0CKI pin

0 = Internal instruction cycle clock (CLKOUT)

bit 4

T0SE: TMR0 Source Edge Select bit

1 = Increment on high-to-low transition on RA2/T0CKI pin

0 = Increment on low-to-high transition on RA2/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

PS2:PS0: Prescaler Rate Select bits

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

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 TMR0 Rate WDT Rate

PIC16F676-E/ST Datasheet(PDF) 14 Page - Microchip Technology

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