PIC16LC554 datasheet(18/96 Pages) MICROCHIP

18 / 96 page

PIC16C55X(A)

DS40143B-page 18

Preliminary

4.2.2.2

OPTION REGISTER

The OPTION register is a readable and writable

the TMR0/WDT prescaler, the external RB0/INT

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

Note: To achieve a 1:1 prescaler assignment for

TMR0, assign the prescaler to the WDT

(PSA = 1).

FIGURE 4-7:

OPTION REGISTER (ADDRESS 81H)

R/W-1

RBPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

= Readable bit

W = Writable bit

- n = Value at POR reset

bit7

bit0

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

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

000

001

010

011

100

101

110

111

1 : 2

1 : 4

1 : 8

1 : 16

1 : 32

1 : 64

1 : 128

1 : 256

1 : 1

1 : 2

1 : 4

1 : 8

1 : 16

1 : 32

1 : 64

1 : 128

Bit Value

TMR0 Rate

WDT Rate

PIC16LC554 数据表(PDF) 18 Page - Microchip Technology

PIC16LC554 数据表(HTML) 18 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96

数据表下载