PIC16LC72T-02I 查看數據表（PDF） - Microchip Technology

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PIC16LC72T-02I

8-Bit CMOS microcontroller with A,D converter

Microchip Technology 

PIC16C72 Series

2.2.2.2 OPTION_REG REGISTER

The OPTION_REG register is a readable and writable

register which contains various control bits to configure

the TMR0 prescaler/WDT postscaler (single assign-

able register known also as the prescaler), the External

INT Interrupt, TMR0, and the weak pull-ups on PORTB.

Note:

To achieve a 1:1 prescaler assignment for

the TMR0 register, assign the prescaler to

the Watchdog Timer.

FIGURE 2-4: OPTION_REG REGISTER (ADDRESS 81h)

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

R/W-1

PS0

bit0

bit 7:

RBPU: PORTB Pull-up Enable bit

1 = PORTB pull-ups are disabled

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

bit 6:

INTEDG: Interrupt Edge Select bit

1 = Interrupt on rising edge of RB0/INT pin

0 = Interrupt on falling edge of RB0/INT pin

bit 5:

T0CS: TMR0 Clock Source Select bit

1 = Transition on RA4/T0CKI pin

0 = Internal instruction cycle clock (CLKOUT)

bit 4:

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

bit 3:

PSA: Prescaler Assignment bit

1 = Prescaler is assigned to the WDT

0 = Prescaler is assigned to the Timer0 module

bit 2-0: PS2:PS0: Prescaler Rate Select bits

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as ‘0’

- n = Value at POR reset

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

DS39016A-page 10

Preliminary

© 1998 Microchip Technology Inc.

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