Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 67)

Rev.A - May 17, 2001 67

Preliminary

T89C51CC02

14.4. Register

WDTPRG (S:A7h)

WatchDog Timer Duration Programming register

Reset Value = XXXX X000b

Figure 54. WDTPRG Register

WDTRST (S:A6h Write only)

WatchDog Timer Enable register

Reset Value = 1111 1111b

NOTE:

The WDRST register is used to reset/enable the WDT by writing 1EH then E1H in sequence.

.

Figure 55. WDTRST Register

7 6 5 4 3 2 1 0

- - - - - S2 S1 S0

Bit Number Bit Mnemonic Description

7-

Reserved

The value read from this bit is indeterminate. Do not set this bit.

6-

Reserved

The value read from this bit is indeterminate. Do not set this bit.

5-

Reserved

The value read from this bit is indeterminate. Do not set this bit.

4-

Reserved

The value read from this bit is indeterminate. Do not set this bit.

3-

Reserved

The value read from this bit is indeterminate. Do not set this bit.

2S2

WatchDog Timer Duration selection bit 2

Work in conjunction with bit 1 and bit 0.

1S1

WatchDog Timer Duration selection bit 1

Work in conjunction with bit 2 and bit 0.

0S0

WatchDog Timer Duration selection bit 0

Work in conjunction with bit 1 and bit 2.

7 6 5 4 3 2 1 0

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Bit Number Bit Mnemonic Description

7-Watchdog Control Value

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 136 137

T89C51CC02 1

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