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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19-42
THE
x86 MICROPROCESSORS
iv) RRC A: Rotate right through carry
The A register is shifted right and the carry bit is moved to D7, while D0 moves into
the carry. See Fig. 19.20.
v) SWAP A: This is a special instruction where the lower and upper nibbles of A are
swapped. See Fig. 19.21.
Example 19.16
Read in data from port 0. Only the upper four bits of this data is needed. Take the upper
four bits and send it as an output nibble to the lower four bits of port 1.
Solution
ORG 0
MOV P0,#0FFH ;make P0 an input port
MOV A,P0 ;move the content of Port0 to A
ANL A,#0F0H ;mask the lower nibble of A
SWAP A ;switch the upper and lower ...
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