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Microprocessor and Microcontroller Technology > How to draw the circuit diagram for the AT89C51AC2 > Flashcards

How to draw the circuit diagram for the AT89C51AC2 Flashcards

Learn how to draw this circuit and learn the values of each component bit by bit

1
Q

What are XTAL1 and XTAL2?

A

XTAL1 is the oscillator input
XTAL2 is the oscillator ouput

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2
Q

How is the circuit connected to XTAL1 and XTAL2?

A

XTAL1 is connected to the capacitor C2 and crystal. The crystal is connected to XTAL2 and another capacitor C1. Both capacitors are connected to ground.

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3
Q

What is RST?

A

RST is the Reset port.

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4
Q

How is the circuit connected to RST?

A

RST is connected to SW2, C3 and R18. C3 is connected to +5V (Power). Power is also connected to the other terminal of SW2. R18 is connected to ground .

This circuit is a pull-down circuit.

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5
Q

What is PSEN?

A

Program Store Enable Pin

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6
Q

What is ALE?

A

Address Latch Enable

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7
Q

What is EA?

A

External Address

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8
Q

What are PSEN (Program Store Enable Pin) and ALE (Address Latch Enable) connected to?

A

Nothing

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9
Q

What is EA (External Address) connected to?

A

Power (Vcc)

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10
Q

Where is Port 1 bits 0-7 located on the 8051 chip?

A

Bottom left on simulation

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11
Q

What is connected to P1.0?

A

A pull-up resistor R17 is connected to power. The other side of R17 is connected to a Switch SW1. SW1 is then connected to ground.

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12
Q

What is the circuit that is connected to P1.0 called?

A

Pull-up circuit and it is the digital input

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13
Q

What is connected to all the bits in P1 besides P1.0?

A

Nothing

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14
Q

Where is Port 0 located on the chip in the simulation?

A

Top Right of the Simulation

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15
Q

Where is Port 2 located on the chip?

A

In between Port 0 and Port 3 of the simulation

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16
Q

Where is Port 3 located on the chip?

A

Bottom right of the simulation

17
Q

What is connected with port 0?

A

The digital outputs

18
Q

How is Port 0 configured?

Hint: Is it in sinking or sourcing mode?

A

It is in sinking mode

19
Q

How is Port 0 bit 7 connected?

A

Power is connected to R1, and in parallel to R1, also connected with power, we have D1 and R2. This is connected to Port 0 bit 7.

20
Q

How is port 0 bit 6 connected?

A

Power is connected to R3, and in parallel to R3, also connected with power, we have D2 and R4. This is connected to Port 0 bit 7.

21
Q

How is port 0 bit 5 connected?

A

Power is connected to R5, and in parallel to R5, also connected with power, we have D3 and R6. This is connected to Port 0 bit 7.

22
Q

How is port 0 bit 4 connected?

A

Power is connected to R7, and in parallel to R7, also connected with power, we have D4 and R8. This is connected to Port 0 bit 7.

23
Q

How is port 0 bit 3 connected?

A

Power is connected to R9, and in parallel to R9, also connected with power, we have D5 and R10. This is connected to Port 0 bit 7.

24
Q

How is port 0 bit 2 connected?

A

Power is connected to R11, and in parallel to R11, also connected with power, we have D6 and R12. This is connected to Port 0 bit 7.

25
Q

How is port 0 bit 1 connected?

A

Power is connected to R13, and in parallel to R13, also connected with power, we have D7 and R14. This is connected to Port 0 bit 7.

26
Q

How is port 0 bit 0 connected?

A

Power is connected to R15, and in parallel to R15, also connected with power, we have D8 and R16. This is connected to Port 0 bit 7.

27
Q

How many bits does Port 4 have?

A

2 bits

28
Q

What is the value of the crystal?

A

X1 = 18.432MHz

29
Q

What are the values of C1 and C2?

A

22pF

30
Q

What is the value of C3?

A

10uF - electrolytic

31
Q

Are the switches SW1 and SW2 normally-open or normally-closed?

A

Normally-open

32
Q

What are the values of R2, R4, R6, R8, R10, R12, R14, R16?

A

560

33
Q

What are the values of R1, R3, R5, R7, R9, R11, R13, R15, R17 and R18?

A

10k

Microprocessor and Microcontroller Technology (6 decks)

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