PIC16F527-ISLASHSS datasheet(17/134 Pages) MICROCHIP

17 / 134 page

 2012-2014 Microchip Technology Inc.

DS40001652C-page 17

PIC16F527

4.4

OPTION Register

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

which contains various control bits to configure the Tim-

er0/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 RAPU and RAWU).

OPTION: OPTION REGISTER

W-1

RAWU(2)

RAPU

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

RAWU: Enable PORTA Interrupt Flag on Pin Change bit(2)

1 = Disabled

0 = Enabled

bit 6

RAPU: Enable PORTA Weak Pull-Ups bit

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.

The RAWU bit of the OPTION register must be set to enable the RAIF function in the INTCON0 register.

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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