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Issue with watchdog timer in AT89S52

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ash8ashok21

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I have written the following code for Setting the WatchdogTimer in 89s52.

Case:1
Code ASM - [expand]
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START: MOV 8EH,#00H     ;Enabling Auxillary Register      
 
WDT:       MOV WDTRST,#1EH
           MOV WDTRST,#0E1H     
                RET

Error While compiling nd converting to HEX Code : Undefined Symbol "WDTRST".


Case:2
Code ASM - [expand]
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START: MOV 8EH,#00H     ;Enabling Auxillary Register      
 
WDT:       MOV 0A6H,#1EH
           MOV 0A6H,#0E1H       
                RET

Error While compiling nd converting to HEX Code : NON-EXISTENT INTERNAL RAM ADDRESS for the address 0x0A6.

Wondering if the problem is with my compiler: 8051 Macro Assembler- version 4.05b.

Please Advise........
 
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