In 8051 micro controller A. INT0 and INT1 pins are normally low B. Timer1 Interrupt Flag is auto cleared after occurrence C. Serial interrupt is auto cleared after occurrence D. Timer 0 Vector location is 000B H Choose the correct answer from the options given below:
B and D only
To determine the correct answer, let's analyze each of the statements provided in the question about the 8051 microcontroller:
- Statement A: INT0 and INT1 pins are normally low
- This statement is not correct. Typically, the INT0 and INT1 external interrupt pins can be configured to be either level-triggered or edge-triggered. In the case of level-triggered, they can be high-level or low-level. Therefore, this statement is not universally true without specific configuration.
- Statement B: Timer1 Interrupt Flag is auto cleared after occurrence
- This statement is correct. In the 8051 microcontroller, the Timer interrupt flags in the TCON (Timer Control) register are automatically cleared by the hardware after the CPU acknowledges the interrupt.
- Statement C: Serial interrupt is auto cleared after occurrence
- This statement is not correct. The Serial interrupt flags (TI and RI) in the SCON (Serial Control) register are not automatically cleared by hardware. They must be cleared by software after the interrupt is processed.
- Statement D: Timer 0 Vector location is 000B H
- This statement is correct. The interrupt vector location for the Timer 0 Overflow Interrupt in the 8051 microcontroller is 000B H.
Now, based on the analysis:
- Statement B is correct because Timer1's interrupt flag is automatically cleared by the hardware.
- Statement D is correct because Timer 0's vector location is indeed 000B H.
- Therefore, the correct answer is B and D only.
Similar Questions
Given below are two statements :
Statement I : In 8051 micro-controller register banks and stack reserves 32 bytes from locations 00 to 1F Hex
Statement II : Bit-Addressable RAM locations are 20 H to 2 F H.
In the light of the above statements, choose the most appropriate answer from the options given below :
Find the delay generated by Timer 0 in the following code of 8051 microcontroller : clock period = 1.085 µs.
MOV TMOD, #01H
MOV TLO, #3DH
MOV THO, #0A2H.
SET B TRO
Loop : J N B TFO, LOOP
CLR TRO
CLR TFO
In "JZ Next" instruction of 8051 microcontroller, which register's content is checked to see if it is zero?
Using 8051 assembly language programming numbers 54 H and 98 H are added. After addition the status of CY, AC and P flags are respectively:
In 8051 microcontroller, one machine cycle lasts in 12 oscillation period. Crystal oscillator's frequency is 11.0592 MHz. Find how long it takes to execute instruction MOV R4, # 25.
Advantage of segmented memory in 8086 is
A. Allows the memory capacity to be 1M byte, although the actual address is of 16 bit size.
B. Allows the placing of code and data portions of the same program in different parts of memory.
C. Allows the memory capacity to be 2M byte, although the actual address is of 16 bit size.
D. Allows the placing of code and data portion of the same program in same parts of memory.
E. Allows the memory capacity to be 1M byte, although the actual address is of 20 bit size
Choose the correct answer from the options given below :
Which of the following statements are correct for a microcontroller ?
A. A microcontroller has on-chip I/O ports
B. A microcontroller has a fixed amount of RAM on the chip
C. The flag register in the 8051 is called program standard word
D. Auxiliary carry flag is set when there is a carry from D3 to D4 during an ADD or SUB operation
E. Overflow flag is only used to detect errors in unsigned arithmetic operations.
Choose the correct answer from the options given below :
Match List I with List II
LIST I (instruction of 8051 microcontroller) LIST II (Addressing mode) A. MOV A, # 32 H I. Register addressing mode B. MOV R 6, A II. Register Indirect addressing mode C. MOV R4, 7 FH III. Immediate Addressing mode D. MOV A, @ RO IV. Direct Addresing mode Choose the correct answer from the options given below:
The ALE line of an 8085 microprocessor is used to
Contents of ‘A’ register after execution of the following 8085 microprocessor program is
MVI A, 55 h
MVI C, 25 h
ADD C
DAA
Important Questions from Microprocessors
Register which is used to store values of arithmetic and logical operations is termed:
How many bytes of bit addressable memory is present in 8051 based microcontrollers?
A single instruction to clear the lower four bits of the accumulator in 8085 assembly language is-
In Microprocessor 8085 Address/Data buffer is a/an _______ buffer.
Microprocessor 8085 operates on a clock cycle with ______ duty cycle.
