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In the 8051 microcontroller, the ALE (Address Latch Enable) pin is used to demarcate the separation of address and data signals on the multiplexed address-data bus. When ALE is activated (typically high), it indicates that the data on the bus is an address, allowing external components to latch this address for memory or I/O operations. This pin plays a crucial role in enabling the microcontroller to communicate effectively with external memory and peripherals by ensuring proper timing and data integrity.
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Btech 4-2 ECEquestion papers?
Draw the pin diagram of 8051 and explain the functioning of each and every pin.
What is psen pin in 8051?
Program Store Enable: The read strobe to external program memory.
What is vpp in 8051 pin diagram?
In the 8051 microcontroller pin diagram, Vpp refers to the programming voltage pin, which is used during the programming of the microcontroller's memory. It is typically set at a high voltage (around 12V) to enable the programming mode for the internal flash or EPROM. This pin is crucial for writing data into the memory during the initial programming phase and is not used during normal operation.
What is 89c51 microcontroller?
89c51 is an microcontroller of 8051 series it is an 8-bit device packed in 40-pin package.
6 wire unipolar stepper motor pin connection?
tel me the connections of 6wire stepper motor with 8051 microcontroller
Is adc present on chip in 8051 or not?
There is no formal adc input on the 8051. However, the CMOS version of the chip can use a technique involving a resistor, diode, and capacitor, along with a bidirectional pin (or one output pin and one input pin) to implement a "quick and dirty" adc function. You discharge the capacitor and then let it charge to the voltage of the input. You measure the time it takes to see the input pin change, and you calculate the input voltage.
What are the control signals for 8051 micro controller?
EA - External Access PSEN - Program store Enable ALE - Address Latch Enable RST - Reset WR - RD
Difference between 8031 8051 and 8751 microcontrollers?
Answer It is both 8 bit processors in a 40 pin package but it is not pin compatible, it have almost the same functions but it is very difficult to compare the two because it is not the same family.
What is ALE in 8085 in microprocessor?
ALE=Address Latch Enabled.(pin number 30 in 8085)8085 has a special pin referred as ALE, which indicates whether multiplex bus functions as an address bus or a data bus. Whenever 8085 starts any new operation, ALE signal goes to logic 1 for about 1/2 clock cycle, at about the falling edge of CLK. If ALE=1 then multiplex bus functions as address bus. After that half clock cycle, it goes to logic 0 for nearly 3 or 4 clock cycles. If ALE=0 then multiplex bus acts as a data bus.The ALE pin helps to enable the latching of lower order ADDR bus. The AD0-AD7 pins, as well as other control pins such as S0, S1, IO/M-, and the other address pins A8-A15, are setup to be correct at the falling edge of ALE.
Why there is no driver circuit needed between 8051 microcontroller and an optoisolater?
Are you referring to the original Intel 8051, or one of the many variants? The 8051 has weak internal pullups on the i/o pins, and can source only about 60 ua, but can sink 1.6 ma, still not much when it comes to driving the led in an opto. Some 8051-based dervatives can sink much more current. Atmel's 89C2051 for instance, can sink up to 20 ma per i/o pin. This can directly drive most optos.
Differences between Intel 8051 and atmel 89c51 micro controller?
The instructions used by Atmel 89CXX and 89CXXXX are the same or subset of 8051 microcontrollers.Fully static operation,flash program memory,less pin count andprecision analog comparator ( in case of 89C20510)are some of the attractions in going for these microcontrollers. Due to many similar features in the architecture and instruction and instruction set as that of 8051, it becomes possible for the 8051 designer to directly start using 89CXX and 89C20XX microcontrollers without any more efforts in learning these microcontrollers.
Who is first invented 8051 microcontroller or 8051 microprocessor?
Intel
