What is the function of the trap flag?
Table of Contents
- 1 What is the function of the trap flag?
- 2 What is the vector address of TF zero flag?
- 3 What is the purpose of zero flag?
- 4 What does a 0 in the zero flag after an arithmetic operation mean?
- 5 When a zero flag is set and a carry flag is set during an ALU operation of a microprocessor?
- 6 Which among flag register set when the result of an arithmetic or logical operation is zero?
- 7 What is trap flag (TF) in microprocessor?
- 8 What is the use of trap flag in 8086?
What is the function of the trap flag?
A trap flag permits operation of a processor in single-step mode. If such a flag is available, debuggers can use it to step through the execution of a computer program.
What is the vector address of TF zero flag?
Introduction
| Interrupt | Flag | Interrupt vector address |
|---|---|---|
| Reset | – | 0000H |
| INT0 (Ext. int. 0) | IE0 | 0003H |
| Timer 0 | TF0 | 000BH |
| INT1 (Ext. int. 1) | IE1 | 0013H |
What is used in debugging along with the trap flag?
Trap Flag (T) in 8086 is used for on-chip debugging. Setting the trap flag puts the microprocessor into a single step mode for debugging. In single stepping, the microprocessor executes an instruction and enters into a single step ISR.
Which of the following control bits of 8086 flag register is used to put the 8086 in single step mode?
Setting trap flag
Detailed Solution. Setting trap flag puts the microprocessor into single step mode for . In status flag first five flag of 8086 microprocessor are same as 8085 microprocessor.
What is the purpose of zero flag?
Along with a carry flag, a sign flag and an overflow flag, the zero flag is used to check the result of an arithmetic operation, including bitwise logical instructions. It is set to 1, or true, if an arithmetic result is zero, and reset otherwise.
What does a 0 in the zero flag after an arithmetic operation mean?
Zero flag (ZF) – the zero flag is set(1) when the result of an arithmetic operation is zero. Unsigned overflow means there has been a carry out of, or a borrow into, the most significant bit (msb) of the destination operand in an arithmetic operation using unsigned numbers.
What is functionality of TF bit of 8086 flag register?
Trap Flag (T) – This flag is used for on-chip debugging. Setting trap flag puts the microprocessor into single step mode for debugging. If trap flag is set (1), the CPU automatically generates an internal interrupt after each instruction, allowing a program to be inspected as it executes instruction by instruction.
Which flag is affected after execution of test instruction?
CMP and TEST instructions affect flags only and do not store a result (these instruction are used to make decisions during program execution). These instructions affect these flags only: CF, ZF, SF, OF, PF, AF.
When a zero flag is set and a carry flag is set during an ALU operation of a microprocessor?
Zero Flag (Z) The zero flag is set (i.e. becomes 1) when the ALU operation results in 0, and the flag is reset (i.e. becomes 0) if the result is nonzero. This flag is affected by the results in the accumulator as well as in the other registers.
Which among flag register set when the result of an arithmetic or logical operation is zero?
Zero flag (ZF) – the zero flag is set(1) when the result of an arithmetic operation is zero.
What is the purpose of Zero flag?
Which instruction does not affect any flag?
As there is no arithmetic or logical operation being performed, no flags are affected by data transfer instructions. Arithmetic instruction: Arithmetic Instructions are the instructions that perform basic arithmetic operations such as addition, subtraction, and a few more.
What is trap flag (TF) in microprocessor?
The Trap Flag (TF) is made to 0, the micro processor will execute complete program in one operation and it is called free running operation. The Trap Flag (TF) is made to 1, the micro processor will execute program in single stepping mode. single stepping mode is used to detect the errors in the program. i.e., software debugging.
What is the use of trap flag in 8086?
Trap Flag (T) in 8086 is used for on-chip debugging. Setting the trap flag puts the microprocessor into a single step mode for debugging. In single stepping, the microprocessor executes an instruction and enters into a single step ISR.
What is flag register of 8086 microprocessor?
Flag register of 8086 microprocessor. The Flag register is a Special Purpose Register. Depending upon the value of result after any arithmetic and logical operation the flag bits become set (1) or reset (0). (a) Status Flags – There are 6 flag registers in 8086 microprocessor which become set (1) or reset
What is interrupt flag I in microprocessor?
Interrupt Flag (I) – This flag is for interrupts. If interrupt flag is set (1), the microprocessor will recognize interrupt requests from the peripherals. If interrupt flag is reset (0), the microprocessor will not recognize any interrupt requests and will ignore them.