Microprocessors and Microcontrollers: Unit III: (b) 8051 Instruction Set and Programming
Byte Level Logical Instructions
8051 Instruction Set and Programming
Review Questions : 1. What is the operation of the given 8051 microcontroller instructions : XRL A, direct? 2. Explain the instruction set of 8051 microcontroller.
Byte Level Logical Instructions
•
The instructions ANL, ORL, and XRL perform the logical functions AND, OR,
and/or Exclusive-OR on the two byte variables indicated, leaving the results in
the first. No flags are affected.
•
The byte-level logical operations use all four addressing modes for the source
of a data byte. Here, directly addressed bytes may be used as the destination
with either the accumulator or a constant as the source. These instructions are
useful for clearing (ANL), setting (ORL) or complementing (XRL) one or more
bits in a RAM, output ports, or control registers.
• This is illustrated in following figures.
•
Table 15.4.1 gives the list of byte level logical operations.
Review Questions
1. What is the
operation of the given 8051 microcontroller instructions : XRL A, direct?
AU : May-11, Marks 2
2. Explain the
instruction set of 8051 microcontroller.
AU : May-10, Marks 10
Microprocessors and Microcontrollers: Unit III: (b) 8051 Instruction Set and Programming : Tag: : 8051 Instruction Set and Programming - Byte Level Logical Instructions