PIC16F5X datasheet(20/90 Pages) MICROCHIP

20 / 90 page

PIC16F5X

DS41213C-page 18

 2004 Microchip Technology Inc.

3.4

Option Register

The Option register is a 6-bit wide, write-only register

which contains various control bits to configure the

Timer0/WDT prescaler and Timer0.

By executing the OPTION instruction, the contents of

the W register will be transferred to the Option register.

A Reset sets the Option<5:0> bits.

OPTION REGISTER

U-0

W-1

—

T0CS

T0SE

PSA

PS2

PS1

PS0

bit 7

bit 0

bit 7-6

Unimplemented: Read as ‘0’

bit 5

T0CS: Timer0 Clock Source Select bit

= Transition on T0CKI pin

= Internal instruction cycle clock (CLKOUT)

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 assigned to the WDT

= Prescaler assigned to Timer0

bit 2-0

PS<2:0>: 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

Timer0 Rate

WDT Rate

PIC16F5X Datasheet(PDF) 20 Page - Microchip Technology

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