PIC16F688T-I/ST データシートの表示（PDF） - Microchip Technology

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PIC16F688T-I/ST

14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F688

REGISTER 11-2: WDTCON: WATCHDOG TIMER CONTROL REGISTER

U-0

—

bit 7

U-0

U-0

R/W-0

R/W-1

R/W-0

—

—

WDTPS3 WDTPS2 WDTPS1

R/W-0

WDTPS0

R/W-0

SWDTEN

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-5

bit 4-1

bit 0

Note 1:

Unimplemented: Read as ‘0’

WDTPS<3:0>: Watchdog Timer Period Select bits

Bit Value = Prescale Rate

0000 = 1:32

0001 = 1:64

0010 = 1:128

0011 = 1:256

0100 = 1:512 (Reset value)

0101 = 1:1024

0110 = 1:2048

0111 = 1:4096

1000 = 1:8192

1001 = 1:16384

1010 = 1:32768

1011 = 1:65536

1100 = Reserved

1101 = Reserved

1110 = Reserved

1111 = Reserved

SWDTEN: Software Enable or Disable the Watchdog Timer(1)

1 = WDT is turned on

0 = WDT is turned off (Reset value)

If WDTE Configuration bit = 1, then WDT is always enabled, irrespective of this control bit. If WDTE

Configuration bit = 0, then it is possible to turn WDT on/off with this control bit.

TABLE 11-8: 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

WDTCON

—

—

— WDTPS3 WDTPS2 WSTPS1 WDTPS0 SWDTEN ---0 1000

OPTION_REG RAPU INTEDG T0CS T0SE PSA

PS2

PS1

PS0 1111 1111

CONFIG

CPD

CP MCLRE PWRTE WDTE FOSC2 FOSC1 FOSC0

—

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

Note 1: See Register 11.0 for operation of all Configuration Word register bits.

Value on

all other

Resets

---0 1000

1111 1111

—

DS41203D-page 124

© 2007 Microchip Technology Inc.

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