PIC16C770 Datasheet

IC型号：
PIC16C770
PDF描述：
18/20-Pin, 8-Bit CMOS Microcontrollers with 10/12-bit A/D
文件大小：
3585.57KB
PDF页数：
220页
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PIC16C717/770/771

2.2.2.2

OPTION_REG REGISTER

Note:

To achieve a 1:1 prescaler assignment for

the TMR0 register, assign the prescaler to

the Watchdog Timer.

The OPTION_REG register is a readable and writable

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.

R/W-1

RBPU

bit7

R/W-1

INTEDG

OPTION REGISTER (OPTION_REG: 81h, 181h)

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

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

- n = Value at POR reset

bit 7:

RBPU:

PORTB Pull-up Enable bit

(1)

= PORTB weak pull-ups are disabled

= PORTB weak pull-ups are enabled by the WPUB register

INTEDG:

Interrupt Edge Select bit

= Interrupt on rising edge of RB0/INT pin

= Interrupt on falling edge of RB0/INT pin

T0CS:

TMR0 Clock Source Select bit

= Transition on RA4/T0CKI pin

= Internal instruction cycle clock (CLKOUT)

T0SE:

TMR0 Source Edge Select bit

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

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

PSA:

Prescaler Assignment bit

= Prescaler is assigned to the WDT

= Prescaler is assigned to the Timer0 module

bit 6:

bit 5:

bit 4:

bit 3:

bit 2-0:

PS<2:0>:

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

Note 1:

Individual weak pull-up on RB pins can be enabled/disabled from the weak pull-up PORTB Register

(WPUB).

漏

1999 Microchip Technology Inc.

Advanced Information

DS41120A-page 17

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