PIC16LC8X-04 查看數據表（PDF） - Microchip Technology

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PIC16LC8X-04

8-Bit CMOS EEPROM Microcontrollers

Microchip Technology 

6.3.1 SWITCHING PRESCALER ASSIGNMENT

The prescaler assignment is fully under software

control (i.e., it can be changed “on the fly” during

program execution).

Note:

To avoid an unintended device RESET, the

following

instruction

sequence

(Example 6-1) must be executed when

changing the prescaler assignment from

Timer0 to the WDT. This sequence must be

taken even if the WDT is disabled. To

change prescaler from the WDT to the

Timer0 module use the sequence shown in

Example 6-2.

EXAMPLE 6-1: CHANGING PRESCALER

(TIMER0→WDT)

BCF

STATUS, RP0 ;Bank 0

CLRF TMR0

;Clear TMR0

; and Prescaler

BSF

STATUS, RP0 ;Bank 1

CLRWDT

;Clears WDT

MOVLW b'xxxx1xxx' ;Select new

MOVWF OPTION

; prescale value

BCF

STATUS, RP0 ;Bank 0

PIC16C8X

EXAMPLE 6-2: CHANGING PRESCALER

(WDT→TIMER0)

CLRWDT

;Clear WDT and

; prescaler

BSF

STATUS, RP0 ;Bank 1

MOVLW b'xxxx0xxx' ;Select TMR0, new

; prescale value

’ and clock source

MOVWF OPTION

;

BCF

STATUS, RP0 ;Bank 0

TABLE 6-1: REGISTERS ASSOCIATED WITH TIMER0

Address Name

Bit 7 Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

Power-on

Reset

Value on all

other resets

01h

TMR0

Timer0 module’s register

0Bh

INTCON

GIE

EEIE

T0IE

INTE

RBIE

T0IF

INTF

RBIF

xxxx xxxx uuuu uuuu

0000 000x 0000 0000

81h

OPTION

RBPU INTEDG T0CS

T0SE

PSA

PS2

PS1

PS0 1111 1111

85h

TRISA

—

—

—

TRISA4

TRISA3 TRISA2 TRISA1 TRISA0 ---1 1111

Legend: x = unknown, u = unchanged. - = unimplemented read as '0'. Shaded cells are not associated with Timer0.

1111 1111

---1 1111

© 1995 Microchip Technology Inc.

DS30081F-page 31

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