May 2024
Intermediate to advanced
503 pages
17h 2m
English
Content preview from 8051 Microcontroller (Internals, Instructions, Programming and Interfacing)
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BOOLEAN VARIABLE MANIPULATION
If the bit of any I/O port is addressed by this instruction, then the data is taken from the input pin of the
port, and not from its output latch.
10.3.4 | JNB Instruction
JNB or ‘Jump if Not Bit set’ is identical with JB with the diff erence in performing the jump as per opposite bit
conditions. In this case, a branching would take place if the addressed bit is zero. Otherwise, it is similar to the JB
instruction in all respects. If any I/O port bit is addressed, then the data would be taken from its input pin, and not
from its output latch. Figs 10.11(a) and (b) illustrate the execution of JNB instruction for ...
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