What does JB mean in assembly language?

Conditional Jump

Instruction	Description	Flags tested
JA/JNBE	Jump Above or Jump Not Below/Equal	CF, ZF
JAE/JNB	Jump Above/Equal or Jump Not Below	CF
JB/JNAE	Jump Below or Jump Not Above/Equal	CF
JBE/JNA	Jump Below/Equal or Jump Not Above	AF, CF

What is assembly condition codes?

Condition codes are extra bits kept by a processor that summarize the results of an operation and that affect the execution of later instructions. These bits are often collected together in a single condition or indicator register (CR/IR) or grouped with other status bits into a status register (PSW/PSR).

What are assembly level instructions?

Assembly language uses a mnemonic to represent each low-level machine instruction or opcode, typically also each architectural register, flag, etc. Many operations require one or more operands in order to form a complete instruction.

What is an instruction in assembly?

An instruction is a statement that is executed at runtime. An x86 instruction statement can consist of four parts: Label (optional) Instruction (required) Operands (instruction specific)

What is jump in assembly language?

A jump instruction, like “jmp”, just switches the CPU to executing a different piece of code. It’s the assembly equivalent of “goto”, but unlike goto, jumps are notconsidered shameful in assembly.

What is Xchg instruction?

In 8085 Instruction set, there is one mnemonic XCHG, which stands for eXCHanGe. This is an instruction to exchange contents of HL register pair with DE register pair. This instruction uses implied addressing mode. As it is1-Byte instruction, so It occupies only 1-Byte in the memory.

What are the four commonly used condition codes?

The most significant four bits of the xPSR are the condition code bits, Negative, Zero, Carry, and oVerflow. These will be set and cleared depending on the results of a data processing instruction. The result of Thumb-2 data processing instructions can set or clear these flags.

What is a condition code?

Condition codes refer to specific form locators in the UB-04 form that demand to describe the conditions applicable to the billing period. It is important to note that condition codes are situational. These codes should be entered in an alphanumeric sequence.

What are the four different types of instructions assembly?

Instruction types include arithmetic, logical, data transfer, and flow control. Instruction modes include kernel and user instructions.

How do loops work in assembly?

The loop instruction always extracts the number of iterations from the ECX register.
The loop instruction decrements the value of ECX and compares it with zero.
If the value in ECX is equal to zero, the program jumps to the L1 label; otherwise, the program exits the loop.

What is JB used for in assembly language?

Might be easier to follow that route than to reverse engineer the assembly. (Disclaimer: I don’t know 8051 assembly language.) Description: JB branches to the address indicated by reladdr if the bit indicated by bit addr is set. If the bit is not set program execution continues with the instruction following the JB instruction.

When does the JB instruction Branch to the second operand?

The JB instruction branches to the address specified in the second operand if the value of the bit specified in the first operand is 1. The bit that is tested is not modified. No flags are affected by this instruction.

What does jb jump to in 8051 assembler?

The JB instruction in 8051 assembler jumps to the address indicated by the label in the second operand if the bit specified by the first operand is set. So in your case it will jump to MOV P0,#0FFH if P0.7 is set.

Where is the JB instruction in the ASM code?

The asm code is included below, unfortunately the documentation, such as it is, is translated very badly from Chinese, which makes it worse than useless. Also its a long time since I’ve used asm! In the code there is a JB instruction in the DELAY subroutine (third last line of code).

What does JB mean in assembly language?