May 2024
Intermediate to advanced
889 pages
30h 8m
English
book
The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
by Lyla B. Das
Content preview from The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
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9-14
THE
x86 MICROPROCESSORS
MOV AL, 90H ;control word
OUT CR, AL ;send it to the control register
IN AL, PA ;take in data through Port A
CMP AL, 7FH ;compare it with 7FH
JA LOW ;if AL > 7FH,go to LOW
MOV AL, 0EH ;AL < 7FH,write a word for PC
7
= 0
OUT CR, AL ;send it to the control register
JMP XIT ;go to exit
LOW: MOV AL, 0FH ;AL > 7F,BSR word for PC
7
= 1 in AL
OUT CR, AL ;send it to the control register
XIT:
END ;end the program
Thus, we see that with the BSR mode, we are able to do ‘bit addressing’ for port pins,
but only for Port C, in the output mode alone.
9.5 | Mode 1
This is also called the handshaking mode.
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