PIC16F720 datasheet(21/254 Pages) MICROCHIP

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DS41430D-page 21

PIC16(L)F720/721

2.2.2.2

OPTION_REG Register

The OPTION_REG register, shown in Register 2-2, is

a readable and writable register, which contains

various control bits to configure:

• Software programmable prescaler for the Timer0/

WDT

• External RA2/INT interrupt

•Timer0

• Weak pull-ups on PORTA or PORTB

Note:

To achieve a 1:1 prescaler assignment for

Timer0, assign the prescaler to the WDT

setting

the

PSA

bit

the

OPTION_REG register to ‘1’. Refer to

Section 12.1.3

“Software

Programmable Prescaler”.

OPTION_REG: OPTION REGISTER

R/W-1

RABPU

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

RABPU: PORTA or PORTB Pull-up Enable bit

1 = PORTA or PORTB pull-ups are disabled

0 = PORTA or PORTB pull-ups are enabled by individual bits in the WPUB register

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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