PIC16F54(2004) Просмотр технического описания (PDF) - Microchip Technology

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PIC16F54
(Rev.:2004)

Flash-Based, 8-Bit CMOS Microcontroller Series

Microchip Technology 

PIC16F5X

3.4 Option Register

The Option register is a 6-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 register.

A Reset sets the Option<5:0> bits.

REGISTER 3-2: OPTION REGISTER

U-0

U-0

W-1

W-1

W-1

—

—

T0CS

T0SE

PSA

bit 7

bit 7-6

bit 5

bit 4

bit 3

bit 2-0

Unimplemented: Read as ‘0’

T0CS: Timer0 Clock Source Select bit

1 = Transition on T0CKI pin

0 = Internal instruction cycle clock (CLKOUT)

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

PSA: Prescaler Assignment bit

1 = Prescaler assigned to the WDT

0 = Prescaler assigned to Timer0

PS<2:0>: Prescaler rate select bits

Bit Value Timer0 Rate WDT Rate

000

1:2

1:1

001

1:4

1:2

010

1:8

1:4

011

1 : 16

1:8

100

1 : 32

1 : 16

101

1 : 64

1 : 32

110

1 : 128

1 : 64

111

1 : 256

1 : 128

W-1

W-1

W-1

PS2

PS1

PS0

bit 0

Legend:

R = Readable bit

- n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

DS41213C-page 18

 2004 Microchip Technology Inc.

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