USED Atmel AT89C52 Microcontroller

AT

8<

/

p>

9<

/

p>C

5<

/

p>

2<

/

p> is an

8<

/

p>-bit microcontroller and belongs to Atmel’s

8<

/

p>0

5<

/

p>

1<

/

p> families. AT

8<

/

p>

9<

/

p>C

5<

/

p>

2<

/

p> has

8<

/

p>KB of Flash programmable and erasable read-only memory (PEROM) and

2<

/

p>

5<

/

p>

6<

/

p> bytes of RAM. AT

8<

/

p>

9<

/

p>C

5<

/

p>

2<

/

p> has an endurance of

1<

/

p>000

Write<

/

p>

/

Erase cycles which means that it can be erased and programmed to a maximum of

1<

/

p>000 times.<

/

p> Specifications of Atmel AT

8<

/

p>

9<

/

p>C

5<

/

p>

2<

/

p> Microcontroller:

Pin No<

/

p>

Function<

/

p>

Name<

/

p>

1<

/

p>

External count input to Timer

/

Counter

2<

/

p>, clock-out<

/

p>

T

2<

/

p><

/

p> P

1<

/

p>.0

2<

/

p> Timer

/

Counter

2<

/

p> capture

/

reload trigger and direction control

T

2<

/

p><

/

p> EX P

1<

/

p>.

1<

/

p>

3<

/

p>

8<

/

p> bit input

/

output port (P

1<

/

p>) pins P

1<

/

p>.

2<

/

p>

4<

/

p> P

1<

/

p>.

3<

/

p>

5<

/

p> P

1<

/

p>.

4<

/

p>

6<

/

p> P

1<

/

p>.

5<

/

p>

7<

/

p> P

1<

/

p>.

6<

/

p>

8<

/

p> P

1<

/

p>.

7<

/

p>

9<

/

p>

Reset<

/

p> pin; Active high<

/

p>

Reset<

/

p>

1<

/

p>0

Input (receiver) for serial communication<

/

p>

RxD<

/

p>

8<

/

p> bit input

/

output port (P

3<

/

p>) pins P

3<

/

p>.0

1<

/

p>

1<

/

p>

Output (transmitter) for serial communication<

/

p>

TxD<

/

p> P

3<

/

p>.

1<

/

p>

1<

/

p>

2<

/

p> External interrupt

1<

/

p>

Int0<

/

p> P

3<

/

p>.

2<

/

p>

1<

/

p>

3<

/

p> External interrupt

2<

/

p> Int

1<

/

p> P

3<

/

p>.

3<

/

p>

1<

/

p>

4<

/

p> Timer

1<

/

p> external input

T0<

/

p> P

3<

/

p>.

4<

/

p>

1<

/

p>

5<

/

p> Timer

2<

/

p> external input T

1<

/

p> P

3<

/

p>.

5<

/

p>

1<

/

p>

6<

/

p>

Write<

/

p> to external data memory<

/

p>

Write<

/

p> P

3<

/

p>.

6<

/

p>

1<

/

p>

7<

/

p>

Read<

/

p> from external data memory<

/

p>

Read<

/

p> P

3<

/

p>.

7<

/

p>

1<

/

p>

8<

/

p> Quartz crystal oscillator (up to

2<

/

p>

4<

/

p> MHz) Crystal

2<

/

p>

1<

/

p>

9<

/

p> Crystal

1<

/

p>

2<

/

p>0

Ground<

/

p> (0V)<

/

p>

Ground<

/

p>

2<

/

p>

1<

/

p>

8<

/

p> bit input

/

output port (P

2<

/

p>) pins

/

High-order address bits when interfacing with external memory

P

2<

/

p>.0

/

A

8<

/

p>

2<

/

p>

2<

/

p> P

2<

/

p>.

1<

/

p>

/

A

9<

/

p>

2<

/

p>

3<

/

p> P

2<

/

p>.

2<

/

p>

/

A

1<

/

p>0

2<

/

p>

4<

/

p> P

2<

/

p>.

3<

/

p>

/

A

1<

/

p>

1<

/

p>

2<

/

p>

5<

/

p> P

2<

/

p>.

4<

/

p>

/

A

1<

/

p>

2<

/

p>

2<

/

p>

6<

/

p> P

2<

/

p>.

5<

/

p>

/

A

1<

/

p>

3<

/

p>

2<

/

p>

7<

/

p> P

2<

/

p>.

6<

/

p>

/

A

1<

/

p>

4<

/

p>

2<

/

p>

8<

/

p> P

2<

/

p>.

7<

/

p>

/

A

1<

/

p>

5<

/

p>

2<

/

p>

9<

/

p>

Prog

ram store enable;

Read<

/

p> from external program memory

PSEN

3<

/

p>0

Address Latch Enable

ALE

Prog

ram pulse input during Flash programming

Prog

3<

/

p>

1<

/

p>

External Access Enable;

Vcc

for internal program executions

EA

Prog

ramming enable voltage;

1<

/

p>

2<

/

p>V (during Flash programming)

Vpp

3<

/

p>

2<

/

p>

8<

/

p> bit input

/

output port (P0) pins

Low-order address bits when interfacing with external memory

P0.

7<

/

p>

/

AD

7<

/

p>

3<

/

p>

3<

/

p> P0.

6<

/

p>

/

AD

6<

/

p>

3<

/

p>

4<

/

p> P0.

5<

/

p>

/

AD

5<

/

p>

3<

/

p>

5<

/

p> P0.

4<

/

p>

/

AD

4<

/

p>

3<

/

p>

6<

/

p> P0.

3<

/

p>

/

AD

3<

/

p>

3<

/

p>

7<

/

p> P0.

2<

/

p>

/

AD

2<

/

p>

3<

/

p>

8<

/

p> P0.

1<

/

p>

/

AD

1<

/

p>

3<

/

p>

9<

/

p> P0.0

/

AD0

4<

/

p>0 Supply voltage;

5<

/

p>V (up to

6<

/

p>.

6<

/

p>V)

Vcc

Package Includes:

1<

/

p> x Atmel AT

8<

/

p>

9<

/

p>C

5<

/

p>

2<

/

p> Microcontroller