PIC16F526-ISLASHP datasheet(19/122 Pages) MICROCHIP

19 / 122 page

 2010 Microchip Technology Inc.

DS41326D-page 19

PIC16F526

4.4

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

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 of RBPU and RBWU).

OPTION: OPTION REGISTER

W-1

RBWU

RBPU

T0CS(1)

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

RBWU: Enable Wake-up On Pin Change bit (RB0, RB1, RB3, RB4)

1 = Disabled

0 = Enabled

bit 6

RBPU: Enable Weak Pull-ups bit (RB0, RB1, RB3, RB4)

1 = Disabled

0 = Enabled

bit 5

T0CS: Timer0 Clock Source Select bit(1)

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

Note 1:

If the T0CS bit is set to ‘1’, it will override the TRIS function on the T0CKI pin.

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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