PIC12F683_07 datasheet(14/176 Pages) MICROCHIP

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PIC12F683

DS41211D-page 12

2.2.2.2

OPTION Register

The OPTION register is a readable and writable

which

contains

various

control

bits

configure:

• TMR0/WDT prescaler

• External GP2/INT interrupt

•TMR0

• Weak pull-ups on GPIO

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 5.1.3 “Software Pro-

grammable Prescaler”.

OPTION_REG: OPTION REGISTER

R/W-1

GPPU

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

GPPU: GPIO Pull-up Enable bit

= GPIO pull-ups are disabled

= GPIO pull-ups are enabled by individual PORT latch values in WPU register

bit 6

INTEDG: Interrupt Edge Select bit

= Interrupt on rising edge of INT pin

= Interrupt on falling edge of INT pin

bit 5

T0CS: Timer0 Clock Source Select bit

= Transition on T0CKI pin

= Internal instruction cycle clock (FOSC/4)

bit 4

T0SE: Timer0 Source Edge Select bit

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

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

bit 3

PSA: Prescaler Assignment bit

= Prescaler is assigned to the WDT

= Prescaler is assigned to the Timer0 module

bit 2-0

PS<2:0>: Prescaler Rate Select bits

Note 1:

A dedicated 16-bit WDT postscaler is available. See Section 12.6 “Watchdog Timer (WDT)” for more

information.

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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