PIC12F508_09 datasheet(24/110 Pages) MICROCHIP

24 / 110 page

PIC12F508/509/16F505

DS41236E-page 24

4.5

OPTION Register

The OPTION register is a 8-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 regis-

ter. A Reset sets the OPTION<7:0> bits.

Note:

If TRIS bit is set to ‘0’, the wake-up on

change and pull-up functions are disabled

for that pin (i.e., note that TRIS overrides

Option

control

GPPU/RBPU

and

GPWU/RBWU).

Note:

If the T0CS bit is set to ‘1’, it will override

the TRIS function on the T0CKI pin.

OPTION REGISTER (PIC12F508/509)

W-1

GPWU

GPPU

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

GPWU: Enable Wake-up on Pin Change bit (GP0, GP1, GP3)

= Disabled

= Enabled

bit 6

GPPU: Enable Weak Pull-ups bit (GP0, GP1, GP3)

= Disabled

= Enabled

bit 5

T0CS: Timer0 Clock Source Select bit

= Transition on T0CKI pin (overrides TRIS on the T0CKI pin)

= Transition on internal instruction cycle clock, FOSC/4

bit 4

T0SE: Timer0 Source Edge Select bit

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

= Increment on low-to-high transition on the 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

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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