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Give detail explanation about Arithmetic Micro-operations
These micro-operations perform some essential arithmetic operations on numeric data stored in the registers. These basic operations can be addition, subtraction, incrementing or decrementing a number and the last one is arithmetic shift operation. An 'add' micro-operation may be specified as: R V R + R3 1 2
It implies: add contents of registers R and R and store sum in register R .1 2 3
The add operation mentioned over requires three registers along with addition circuit in ALU.
Subtraction is implemented with complement and addition operation as:
R V R - R3 1 2 is implemented as
R V R + (2's complement of R )3 1 2
R V R + (1's complement of R + 1)3 1 2
R V R + R + 13 1 2
An increment operation can be shown as:
R V R + 11 1
While a decrement operation can be refer as:
R V R - 11 1
What do you mean by memory mapped I/O? In Memory mapped I/O, there is no particular input or output instructions. The CPU can manipulate I/O data residing in interface register
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