CF745 データシートの表示（PDF） - Microchip Technology

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CF745

EPROM/ROM-Based 8-Bit CMOS Microcontroller Series

Microchip Technology 

PIC16C5X

4.4 OPTION Register

The OPTION register is a 6-bit wide, write-only

register which contains var ious control bits to

configure the Timer0/WDT prescaler and Timer0.

By executing the OPTION instruction, the contents of

the W register will be transferred to the OPTION

register. A RESET sets the OPTION<5:0> bits.

FIGURE 4-9: OPTION REGISTER

U-0

U-0

W-1

W-1

W-1

W-1

W-1

W-1

—

—

T0CS T0SE

PSA

PS2

PS1

PS0

bit7

6

5

4

3

2

1

bit0

bit 7-6: Unimplemented.

bit 5:

T0CS: Timer0 clock source select bit

1 = Transition on T0CKI pin

0 = Internal instruction cycle clock (CLKOUT)

bit 4:

T0SE: Timer0 source edge select bit

1 = Increment on high-to-low transition on T0CKI pin

0 = Increment on low-to-high transition on T0CKI pin

bit 3:

PSA: Prescaler assignment bit

1 = Prescaler assigned to the WDT (not implemented on PIC16C52)

0 = Prescaler assigned to Timer0

bit 2-0: PS2:PS0: Prescaler rate select bits

Bit Value Timer0 Rate WDT Rate (not implemented on PIC16C52)

000

1:2

1:1

001

1:4

1:2

010

1:8

1:4

011

1 : 16

1:8

100

1 : 32

1 : 16

101

1 : 64

1 : 32

110

1 : 128

1 : 64

111

1 : 256

1 : 128

W = Writable bit

U = Unimplemented bit

- n = Value at POR reset

© 1998 Microchip Technology Inc.

Preliminary

DS30453B-page 21

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