PIC16F506T-ESLASHMCSQTP datasheet(44/116 Pages) MICROCHIP

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PIC12F510/16F506

DS41268C-page 42

Preliminary

6.2.1

SWITCHING PRESCALER

ASSIGNMENT

The prescaler assignment is fully under software

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

gram execution). 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.

EXAMPLE 6-1:

CHANGING PRESCALER

(TIMER0

→ WDT)

To change prescaler from the WDT to the Timer0

module, use the sequence shown in Example 6-2. This

sequence must be used even if the WDT is disabled. A

CLRWDT

instruction

should

executed

before

switching the prescaler.

EXAMPLE 6-2:

CHANGING PRESCALER

(WDT

→TIMER0)

FIGURE 6-5:

BLOCK DIAGRAM OF THE TIMER0/WDT PRESCALER

CLRWDT

;Clear WDT

CLRF

TMR0

;Clear TMR0 & Prescaler

MOVLW

‘00xx1111’b

;These 3 lines (5, 6, 7)

OPTION

;are required only if

;desired

CLRWDT

;PS<2:0> are 000 or 001

MOVLW

‘00xx1xxx’b

;Set Postscaler to

OPTION

;desired WDT rate

CLRWDT

;Clear WDT and

;prescaler

MOVLW

‘xxxx0xxx’

;Select TMR0, new

;prescale value and

;clock source

OPTION

TCY (= FOSC/4)

Sync

Cycles

TMR0 Reg

8-bit Prescaler

8-to-1 MUX

MUX

Watchdog

Timer

PSA(1)

WDT

Time-Out

PS<2:0>(1)

PSA(1)

WDT Enable bit

Data Bus

PSA(1)

T0CS(1)

T0SE(1)

T0CKI(2)

Note 1:

T0CS, T0SE, PSA, PS<2:0> are bits in the OPTION register.

T0CKI is shared with pin GP2 on the PIC12F510 and shared with RC5 on the PIC16F506.

Bit C1T0CS is located in the CM1CON0 register.

Comparator

Output

C1T0CS(3)

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