PIC16F716 查看數據表（PDF） - Microchip Technology

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PIC16F716

8-bit Flash-based Microcontroller with A/D Converter and Enhanced Capture/Compare/PWM

Microchip Technology 

PIC16F716

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

assignable 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.

REGISTER 2-2:

OPTION_REG REGISTER (ADDRESS: 81h)

R/W-1 R/W-1 R/W-1 R/W-1

R/W-1

RBPU

bit 7

INTEDG

T0CS

T0SE

PSA

R/W-1

PS2

R/W-1

PS1

R/W-1

PS0

bit 0

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2-0

RBPU: PORTB Weak Pull-up Enable bit

1 = PORTB weak pull-ups are disabled

0 = PORTB weak pull-ups are determined by alternate function or TRISBn bit value

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

000

001

010

011

100

101

110

111

TMR0 Rate

1:2

1:4

1:8

1 : 16

1 : 32

1 : 64

1 : 128

1 : 256

WDT Rate

1:1

1:2

1:4

1:8

1 : 16

1 : 32

1 : 64

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

DS41206A-page 12

Preliminary

 2003 Microchip Technology Inc.

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