PIC12F609T-I/P View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC12F609T-I/P

8-Pin Flash-Based, 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC12F609/615/617/12HV609/615

12.6.2 WDT PROGRAMMING

CONSIDERATIONS

It should also be taken in account that under worst-

case conditions (i.e., VDD = Min., Temperature = Max.,

Max. WDT prescaler) it may take several seconds

before a WDT time out occurs.

FIGURE 12-2:

CLKOUT

(= FOSC/4)

WATCHDOG TIMER BLOCK DIAGRAM

0

T0CKI

pin

T0SE

1

0

T0CS

1

PSA

Watchdog

Timer

8-bit

Prescaler

8

3

PS<2:0>

1

SYNC 2

Cycles

0

PSA

1

WDT

Time-Out

0

WDTE

Note 1: T0SE, T0CS, PSA, PS<2:0> are bits in the OPTION register.

PSA

Data Bus

8

TMR0

Set Flag bit T0IF

on Overflow

TABLE 12-8: WDT STATUS

Conditions

WDTE = 0

CLRWDT Command

Oscillator Fail Detected

Exit Sleep + System Clock = T1OSC, EXTRC, INTRC, EXTCLK

Exit Sleep + System Clock = XT, HS, LP

WDT

Cleared

Cleared until the end of OST

TABLE 12-9: SUMMARY OF REGISTERS ASSOCIATED WITH WATCHDOG TIMER

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value on

POR, BOR

Value on

all other

Resets

OPTION_REG GPPU INTEDG T0CS T0SE PSA

PS2

PS1

CONFIG

IOSCFS CP MCLRE PWRTE WDTE FOSC2 FOSC1

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

Note 1: See Register 12-1 for operation of all Configuration Word register bits.

PS0

FOSC0

1111 1111

—

1111 1111

—

DS41302D-page 122

 2010 Microchip Technology Inc.

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