E m b e d d e d AT X B o a r d
Enter_Configuration_Mode PROC NEAR
MOV
SI,WORD PTR CS:[Offset Cfg_Port]
MOV
DX,02Eh
MOV
CX,04h
Init_1:
MOV
AL,BYTE PTR CS:[SI]
OUT
DX,AL
INC
SI
LOOP
Init_1
RET
Enter_Configuration_Mode ENDP
Exit_Configuration_Mode PROC NEAR
MOV
AX,0202h
CALL
Write_Configuration_Data
RET
Exit_Configuration_Mode ENDP
Check_Chip PROC NEAR
MOV
AL,20h
CALL
Read_Configuration_Data
CMP
AL,87h
JNE
Not_Initial
E M B - 8 3 0
Appendix A Programming the Watchdog Timer
A-7