PIC16LC61-04I/L View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LC61-04I/L

8-Bit CMOS Microcontrollers

Microchip Technology 

PIC16C6X

4.2.2.2 OPTION REGISTER

Applicable Devices

61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67

The OPTION register is a readable and writable regis-

ter which contains various control bits to configure the

TMR0/WDT prescaler, the external INT interrupt,

TMR0, and the weak pull-ups on PORTB.

Note:

To achieve a 1:1 prescaler assignment for

TMR0 register, assign the prescaler to the

Watchdog Timer.

FIGURE 4-10: OPTION REGISTER (ADDRESS 81h, 181h)

R/W-1

RBPU

bit7

R/W-1

INTEDG

R/W-1

T0CS

R/W-1

T0SE

R/W-1

PSA

R/W-1

PS2

R/W-1

PS1

bit 7:

bit 6:

bit 5:

bit 4:

bit 3:

bit 2-0:

RBPU: PORTB Pull-up Enable bit

1 = PORTB pull-ups are disabled

0 = PORTB pull-ups are enabled by individual port latch values

INTEDG: Interrupt Edge Select bit

1 = Interrupt on rising edge of RB0/INT pin

0 = Interrupt on falling edge of RB0/INT pin

T0CS: TMR0 Clock Source Select bit

1 = Transition on RA4/T0CKI pin

0 = Internal instruction cycle clock (CLKOUT)

T0SE: TMR0 Source Edge Select bit

1 = Increment on high-to-low transition on RA4/T0CKI pin

0 = Increment on low-to-high transition on RA4/T0CKI pin

PSA: Prescaler Assignment bit

1 = Prescaler is assigned to the WDT

0 = Prescaler is assigned to the Timer0 module

PS2:PS0: Prescaler Rate Select bits

Bit Value TMR0 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

R/W-1

PS0

bit0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as ‘0’

- n = Value at POR reset

DS30234D-page 36

© 1997 Microchip Technology Inc.

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