register, Preliminary, Register – Rainbow Electronics T89C51CC02 User Manual
Page 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.
2
S2
WatchDog Timer Duration selection bit 2
Work in conjunction with bit 1 and bit 0.
1
S1
WatchDog Timer Duration selection bit 1
Work in conjunction with bit 2 and bit 0.
0
S0
WatchDog Timer Duration selection bit 0
Work in conjunction with bit 1 and bit 2.
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
-
Bit Number Bit Mnemonic
Description
7
-
Watchdog Control Value