PIC16LC72AT-10E/SP 查看數據表（PDF） - Microchip Technology

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PIC16LC72AT-10E/SP

28-Pin 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC16C62B/72A

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 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.

REGISTER 2-2: 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

bit 7:

RBPU: PORTB Pull-up Enable bit

1 = PORTB pull-ups are disabled

0 = PORTB pull-ups are enabled for all PORTB inputs

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

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

- n = Value at POR reset

DS35008B-page 12

Preliminary

© 1999 Microchip Technology Inc.

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