PIC16C621A Datasheet

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PIC16C62X

4.2.2.2

OPTION REGISTER

Note:

To achieve a 1:1 prescaler assignment for

TMR0, assign the prescaler to the WDT

(PSA = 1).

The OPTION register is a readable and writable

register which contains various control bits to con铿乬ure

the TMR0/WDT prescaler, the external RB0/INT

interrupt, TMR0, and the weak pull-ups on PORTB.

FIGURE 4-9:

R/W-1

RBPU

bit7

OPTION 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

- 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 is assigned to the WDT

0 = Prescaler is assigned to the Timer0 module

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

漏

1998 Microchip Technology Inc.

Preliminary

DS30235G-page 19

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