Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller SOIC 14 8-Bit 20 MHz I/O number 11

PIC12F510/16F506

4.4 OPTION Register

The OPTION register is a 8-bit wide, write-only register,

that 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

Note 1: 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 of GPPU

/RBPU

and GPWU/RBWU).

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

the TRIS function on the T0CKI pin.

W-1 W-1 W-1 W-1 W-1 W-1 W-1 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)

1 = Disabled

0 = Enabled

bit 6

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

1 = Disabled

0 = Enabled

bit 5

T0CS: Timer0 Clock Source Select bit

1 = Transition on T0CKI pin

0 = Internal instruction cycle clock (CLKOUT)

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 assigned to the WDT

0 = 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