PIC16CR83 Datasheet

IC型号：
PIC16CR83
PDF描述：
18-pin Flash/EEPROM 8-Bit Microcontrollers
文件大小：
2018.18KB
PDF页数：
125页
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PIC16F8X

4.2.2.2

OPTION_REG REGISTER

Note:

When the prescaler is assigned to

the WDT (PSA = '1'), TMR0 has a 1:1

prescaler assignment.

The OPTION_REG register is a readable and writable

the TMR0/WDT prescaler, the external INT interrupt,

TMR0, and the weak pull-ups on PORTB.

FIGURE 4-1:

R/W-1

RBPU

bit7

OPTION_REG REGISTER (ADDRESS 81h)

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/W-1

INTEDG

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 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 assigned to the WDT

0 = Prescaler assigned to TMR0

bit 6:

bit 5:

bit 4:

bit 3:

bit 2-0:

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

DS30430C-page 16

漏

1998 Microchip Technology Inc.

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