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Write a control word for counter 1 of 8253 / 8254 that selects the following options: load least significant byte only, mode 5 of operation and binary counting. Then write an instruction sequence that will load the control word into 8253 / 8254 that is located at address 01000 h of memory address space. Assume that 8253 / 8254 is attached to the I/O bus of the CPU and the address inputs A0 and A1 are supplied by A2 and A3 respectively.
Ans:
8253/54 Word Format
Depends on the above specified conditions and assuming counter 0 is utilized. The word becomes 0001 1010h.
Know the port address
- The CS is enabled while A7=1
- The Control Register is selected while A1 and A0 =1
- Assuming unemployed address lines A6 to A2 are at logic 0,
Then port address will be as given below
Control Register = 83H
Counter 2 = 82H
MVI A,B0H
OUT 83H
MVI A, LOWBYTE
OUT 82H
MVI A,HIGHBYTE
LOOP:MVI A,80H
IN 82H
MOV D,A
ORA D
JNZ LOOP
RET
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