PIC16C73B datasheet(96/184 Pages) MICROCHIP

96 / 184 page

PIC16C63A/65B/73B/74B

DS30605C-page 96

 2000 Microchip Technology Inc.

13.7.2

WDT PROGRAMMING

CONSIDERATIONS

It should also be taken into account that under worst

case conditions (VDD = Min., Temperature = Max., and

max. WDT prescaler), it may take several seconds

before a WDT time-out occurs.

FIGURE 13-6:

WATCHDOG TIMER BLOCK DIAGRAM

TABLE 13-7:

SUMMARY OF WATCHDOG TIMER REGISTERS

Note:

When a CLRWDT instruction is executed

and the prescaler is assigned to the WDT,

the prescaler count will be cleared, but the

prescaler assignment is not changed.

From TMR0 Clock Source

(Figure 6-1)

To TMR0 MUX (Figure 6-1)

Postscaler

WDT Timer

WDT

Enable Bit

PSA

8 - to - 1 MUX

PS2:PS0

MUX

PSA

WDT

Time-out

Note: PSA and PS2:PS0 are bits in the OPTION register.

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

2007h

Config. bits

–

BODEN(1)

CP1

CP0

PWRTE(1)

WDTE

FOSC1

FOSC0

81h

OPTION_REG

RBPU

INTEDG

T0CS

T0SE

PSA

PS2

PS1

PS0

Legend: Shaded cells are not used by the Watchdog Timer.

Note 1: See Register 13-1 for operation of these bits.

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