What are conditional and control flag in 8086?
Table of Contents
- 1 What are conditional and control flag in 8086?
- 2 What is the difference between status flag and control flag?
- 3 How many conditional and control flags are there in 8086 microprocessor?
- 4 Which are control flags in 8086 how do they control operations?
- 5 What are conditional and control flags?
- 6 What are flag registers in 8086?
- 7 How flag register of 8086 is different from 8085 which flags are present in 8086 but not in 8085 explain their working?
What are conditional and control flag in 8086?
(a) Status Flags – There are 6 flag registers in 8086 microprocessor which become set(1) or reset(0) depending upon condition after either 8-bit or 16-bit operation. These flags are conditional/status flags.
What is the difference between status flag and control flag?
There are two types of flags: The status flags Reflect the result of executing an instruction which reflect the result of executing an instruction. The control flags Enable or disable certain CPU operations enable or disable certain CPU operations. The programmer can set/reset these bits to control the CPU’s operation.
What is a conditional flag?
Forth conditionals use flags to indicate true/false values. A flag can be generated in several ways, based on testing criteria. The flag can then be displayed from the stack with the word “.”, or it can be used as input to a conditional control command.
How many conditional and control flags are there in 8086 microprocessor?
In 8086 there are 6 different flags which are set or reset after 8-bit or 16-bit operations.
Which are control flags in 8086 how do they control operations?
The 8086 has three control flags namely TF, IF and DF. All three of them can be user programmed to suit their needs. The trap flag allows the CPU to run in a single stepping mode. This comes in very handy in debugging and development purposes.
How Flag register of 8086 is different from 8085 which flags are present in 8086 but not in 8085 explain their working?
Both 8085 and 8086 are two major microprocessors designed by Intel….Comparison Chart.
| Basis for Comparison | 8085 | 8086 |
|---|---|---|
| Number of flags present | 5 | 9 |
| Number of transistors | Less (around 6500) | More (around 29000) |
| Operating mode | Only one | Two (minimum and maximum mode) |
| Pipelining | Unsupportable | Supportable |
What are conditional and control flags?
Control flag will be set/reset by the processor and conditional flag will be controlled set/reset by the programmer.
What are flag registers in 8086?
8086 has 16-bit flag register, and there are 9 valid flag bits….Status Flags.
| Flag Bit | Function |
|---|---|
| CY | This is carry bit. If some operations are generating carry after the operation this flag is set to 1 |
| O | The overflow flag is set to 1 when the result of a signed operation is too large to fit. |
What is a flag in programming?
In programming, a flag is a predefined bit or bit sequence that holds a binary value. Typically, a program uses a flag to remember something or to leave a sign for another program.