PIC16C558-04 查看數據表（PDF） - Microchip Technology

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PIC16C558-04

ERROM-based 8-Bit CMOS microcontroller

Microchip Technology 

PIC16C55X

FIGURE 6-13:

WATCHDOG TIMER BLOCK DIAGRAM

From TMR0 Clock Source

(Figure 7-6)

Watchdog

Timer

WDT

Enable Bit

0M

1U

X

PSA

Postscaler

8

8 - to - 1 MUX

PS<2:0>

0

1

MUX

To TMR0

(Figure 7-6)

PSA

WDT

Timeout

Note 1: T0SE, T0CS, PSA, PS0-PS2 are bits in the OPTION register.

TABLE 6-7: SUMMARY OF WATCHDOG TIMER REGISTERS

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

2007h Config. bits — Reserved CP1 CP0 PWRTE WDTE FOSC1 FOSC0

81h

OPTION RBPU INTEDG T0CS T0SE PSA PS2 PS1 PS0 1111 1111 1111 1111

Legend: x = unknown, u = unchanged, q = value depends on condition, — = unimplemented, read as ‘0’.

Shaded cells are not used by the Watchdog Timer.

DS40143D-page 44

Preliminary

 2002 Microchip Technology Inc.

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