PIC16C54 View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C54

EPROM/ROM-Based 8-bit CMOS Microcontroller Series

Microchip Technology 

PIC16C5X

6.4 OPTION Register

The OPTION Register is a 6-bit wide, write-only regis-

ter 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 Reg-

ister. A RESET sets the OPTION<5:0> bits.

REGISTER 6-2: OPTION REGISTER

U-0

U-0

W-1

W-1

W-1

W-1

W-1

W-1

—

—

T0CS

TOSE

PSA

PS2

PS1

PS0

bit 7

bit 0

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

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

DS30453E-page 30

Preliminary

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