PIC12LC671T datasheet(43/130 Pages) MICROCHIP

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DS30561C-page 43

PIC12C67X

7.3.1

SWITCHING PRESCALER ASSIGNMENT

The prescaler assignment is fully under software con-

trol, (i.e., it can be changed “on-the-fly” during program

execution).

EXAMPLE 7-1:

CHANGING PRESCALER

(TIMER0

WDT)

BCF

STATUS, RP0

;Bank 0

CLRF

TMR0

;Clear TMR0 & Prescaler

BSF

STATUS, RP0

;Bank 1

CLRWDT

;Clears WDT

MOVLW

b'xxxx1xxx'

;Select new prescale

MOVWF

OPTION_REG

;value & WDT

BCF

STATUS, RP0

;Bank 0

Note:

To avoid an unintended device RESET, the

following instruction sequence (shown in

Example 7-1) must be executed when

changing the prescaler assignment from

Timer0 to the WDT. This sequence must

be followed even if the WDT is disabled.

To change prescaler from the WDT to the Timer0 mod-

ule, use the sequence shown in Example 7-2.

EXAMPLE 7-2:

CHANGING PRESCALER

(WDT

TIMER0)

CLRWDT

;Clear WDT and

;prescaler

BSF

STATUS, RP0 ;Bank 1

MOVLW

b'xxxx0xxx' ;Select TMR0, new

;prescale value and

MOVWF

OPTION_REG

;clock source

BCF

STATUS, RP0 ;Bank 0

TABLE 7-1:

REGISTERS ASSOCIATED WITH TIMER0

Address Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR

Value on

all other

Resets

01h

TMR0

Timer0 module’s register

xxxx xxxx

uuuu uuuu

0Bh/8Bh

INTCON

GIE

PEIE

T0IE

INTE

GPIE

T0IF

INTF

GPIF

0000 000x

0000 000u

81h

OPTION

GPPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

1111 1111

85h

TRIS

—

TRIS5

TRIS4

TRIS3

TRIS2

TRIS1

TRIS0

--11 1111

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

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