How Do You Subtract Two 16 Bit Numbers?

1. Get the LSB in L register and MSB in H register of 16 Bit number.
2. Exchange the content of HL register with DE register.
3. Again Get the LSB in L register and MSB in H register of 16 Bit number.
4. Subtract the content of L register from the content of E register.

Do programs multiply 2 16 bit numbers?

We can do multiplication in 8086 with MUL instruction. For 16-bit data the result may exceed the range, the higher order 16-bit values are stored

at DX register

.

What is the function of CX register in the subtraction program of two 16 bit numbers?

BX, CX are general purpose registers where BX is used for storing second number and CX is

used to store borrow

.

How can I add two 16 bit numbers in 8086?

1. Load 0000H into CX register (for carry)
2. Load the data into AX(accumulator) from memory 3000.
3. Load the data into BX register from memory 3002.
4. Add BX with Accumulator AX.
5. Jump if no carry.
6. Increment CX by 1.
7. Move data from AX(accumulator) to memory 3004.

How do you subtract in microprocessor?

1. Load 00 in a register C (for borrow)
2. Load two 8-bit number from memory into registers.
3. Move one number to accumulator.
4. Subtract the second number with accumulator.
5. If borrow is not equal to 1, go to step 7.
6. Increment register for borrow by 1.

How do you subtract 1 in binary?

What is the use of HLT instruction *?

In the x86 computer architecture, HLT (halt) is an

assembly language instruction which halts the central processing unit (CPU) until the next external interrupt is fired

. Interrupts are signals sent by hardware devices to the CPU alerting it that an event occurred to which it should react.

How do you add two 16-bit numbers?

1. Load both the lower and the higher bits of first number at once.
2. Copy the first number to another register pair.
3. Load both the lower and the higher bits of second number at once.
4. Add both the register pairs and store the result in a memory location.

What are 16-bit numbers?

A 16-bit integer can store 2

¹⁶

(or 65,536) distinct values. In an unsigned representation, these values are the

integers between 0 and 65,535

; using two’s complement, possible values range from −32,768 to 32,767. Hence, a processor with 16-bit memory addresses can directly access 64 KB of byte-addressable memory.

How do you write 16-bit numbers?

The smallest signed 16-bit number

is -32768

and the largest is 32767. For example, 1101,0000,0000,0100

₂

or 0xD004 is -32768+16384+4096+4 or -12284.

How do you subtract in 8085?

In 8085, the SUB instruction is used 2’s complemented method for subtraction.

When the first operand is larger, the result will be positive

. It will not enable the carry flag after completing the subtraction. When the result is negative, then the result will be in 2’s complemented form and carry flag will be enabled.

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.

Can you borrow from a 0 in subtraction?

So, if 0 is nothing, how do we borrow from it in a subtraction problem?

The key is to borrow from the next digit to the left. You can go as far to the left as you need to

. So if you were to do 306-98 you would first borrow from the 3, to make the 0 a 10.

What are the rules of subtraction?

• Review the following Subtraction Rules and Properties: The Identity Property of Subtraction (also known as the Zero Rule of Subtraction):
• Any number minus zero equals itself. ( 2 – 0 = 2) …
• one. ( 5 − 1 = 4) …
• zero. ( 2 – 2 = 0) …
• the number just before it equals one. ( 3 − 2 = 1)

What is base 8 called?

The octal numeral system