CF745 datasheet(21/217 Pages) MICROCHIP

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Preliminary

DS30453B-page 21

PIC16C5X

4.4

OPTION Register

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

conﬁgure the Timer0/WDT prescaler and Timer0.

By executing the OPTION instruction, the contents of

the W register will be transferred to the OPTION

FIGURE 4-9:

OPTION REGISTER

U-0

W-1

—

T0CS

T0SE

PSA

PS2

PS1

PS0

W = Writable bit

= Unimplemented bit

- n = Value at POR reset

bit7

bit0

bit 7-6:

Unimplemented.

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 (not implemented on PIC16C52)

0 = Prescaler assigned to Timer0

bit 2-0:

PS2:PS0: 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 (not implemented on PIC16C52)

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