Which microcontroller has 6 interrupt sources?
8051 has an interrupt priority register to assign priority to interrupts. Bit 7,6,5 – Reserved bits.
What are the five different interrupts in 8051?
8051 has five interrupts. These interrupts are INT0, INT1,TO ,T1 , TI/RI. All of the interrupts can be enabled or disabled by using the IE (interrupt enable) register.
Which pin of the 8051 microcontroller is used As INT 0 interrupt?
Microcontroller 8051 is consisting of two external hardware interrupts: INT0 and INT1 as discussed above. These interrupts are enabled at pin 3.2 and pin 3.3. It can be level triggered or edge triggered.
What pin is external interrupt 0?
2 and P3. 3 (INT0′, INT1′ ) : 12th and 13th pins are for External Hardware Interrupt 0 and Interrupt 1 respectively.
How many interrupt sources are there in 8051?
5 sources
The 8051 architecture can handle interrupts from 5 sources. These are: the two external interrupt lines, two timers and the serial interface. Each one of these is assigned an interrupt vector address.
How many interrupts are there in microcontroller Mcq?
Explanation: There are three external hardware interrupts in the atmega32 microcontrollers.
Which port pin of the 8051 is used as external interrupt 0?
It is used to enable/disable the external memory interfacing. Pin 31 − This is ALE pin which stands for Address Latch Enable. It is used to demultiplex the address-data signal of port. Pins 32 to 39 − These pins are known as Port 0.
What are external interrupts in 8051?
In an 8051 micro controller there are 2 external interrupts, 2 timer interrupts, and 1 serial interrupt….Interrupt sources.
| Interrupt Source | Vector address | Interrupt priority |
|---|---|---|
| Timer 0 Interrupt | 000BH | 2 |
| External Interrupt 1 –INT1 | 0013H | 3 |
| Timer 1 Interrupt | 001BH | 4 |
| Serial Interrupt | 0023H | 5 |
Which of the following interrupts in 8051 has the lowest priority?
8051 architecture handles 5 interrupt sources, out of which two are internal (Timer interrupts), two are external and one is a serial interrupt. Each of their interrupts has its vector address. The highest interrupt priority upon reset in 8051 is external interrupt 0.
How many external interrupt sources are there in 8051 microcontroller Mcq?
two external interrupt inputs
Explanation: INT0(active low) and INT1(active low) are two external interrupt inputs provided by 8051.
Which pin resets the 8051 microcontroller?
A HIGH on which pin resets the 8051 microcontroller? 50. An alternate function of port pin P3.
What is the function of 8051 microcontroller?
8051 microcontroller is a 40 pin Dual Inline Package (DIP). These 40 pins serve different functions like read, write, I/O operations, interrupts etc. 8051 has four I/O ports wherein each port has 8 pins which can be configured as input or output depending upon the logic state of the pins.
How to enable/disable interrupts in 8051?
8051 has 5 interrupt signals, i.e. INT0, TFO, INT1, TF1, RI/TI. Each interrupt can be enabled or disabled by setting bits of the IE register and the whole interrupt system can be disabled by clearing the EA bit of the same register. IE (Interrupt Enable) Register This register is responsible for enabling and disabling the interrupt.
How many pins are dedicated to the I/O ports in 8051?
These 40 pins serve different functions like read, write, I/O operations, interrupts etc. 8051 has four I/O ports wherein each port has 8 pins which can be configured as input or output depending upon the logic state of the pins. Therefore, 32 out of these 40 pins are dedicated to I/O ports.
What is the function of pin 9 on a microcontroller?
It is internally pulled up, bi-directional I/O port. Pin 9 − It is a RESET pin, which is used to reset the microcontroller to its initial values. Pins 10 to 17 − These pins are known as Port 3. This port serves some functions like interrupts, timer input, control signals, serial communication signals RxD and TxD, etc.