Atmel AT89C51 Microcontroller

AT89C5

1

is an 8-bit microcontroller and belongs to Atmel’s

8

0

5

1

family. ATMEL 89C5

1

has

4

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

1

2

8 bytes of RAM. It can be erased and program to a maximum of

1

0

0

0

times. In

4

0

pin AT89C5

1

, there are four ports designated as P

1

, P

2

, P3 and P

0

. All these ports are 8-bit bi-directional ports, i.e., they can be used as both input and output ports. Except P

0

which needs external pull-ups, rest of the ports have internal pull-ups. When

1

s are written to these port pins, they are pulled high by the internal pull-ups and can be used as inputs. These ports are also bit addressable and so their bits can also be accessed individually. Port P

0

and P

2

are also used to provide low byte and high byte addresses, respectively, when connected to an external memory. Port 3 has multiplexed pins for special functions like serial communication, hardware interrupts, timer inputs and read/write operation from external memory. AT89C5

1

has an inbuilt UART for serial communication. It can be programmed to operate at different baud rates. Including two timers & hardware interrupts, it has a total of six interrupts. Features of Atmel AT89C5

1

Microcontroller:

CPU

8-bit

8

0

5

1

family

Architecture

8

0

5

1

Program Memory Size (Kbytes)

4

K Flash

RAM (bytes)

1

2

8

EEPROM/HEF

Nil

Pin Count

4

0

Max.

CPU

Speed (MHz)

2

4

Peripheral Pin select (PPS)

No

Internal Oscillator

No

No

. Of comparators

2

No

. Of Operational Amplifier

0

No

. Of ADC channels

Nil

Max ADC Resolution (bits)

NA

ADC with Computation

No

Number of DAC Converter

0

Max DAC resolution

0

Internal Voltage Reference

NA

Zero Cross Detect

No

No

. Of 8-bit timers

0

No

. Of

1

6-bit Timers

2

Signal Measurement Timer

0

Hardware Limit Timer

0

No

. Of PWM outputs

0

Max PWM resolution

NA

Angular Timer

No

Math Accelerator

No

No

. Of UART module

1

No

. Of SPI Module

0

No

. Of I

2

C module

0

No

. Of USB Module

0

Windowed Watchdog Timer (WWDT)

No

CRC/Scan

No

Numerically Controlled Oscillator

0

Cap. Touch Channels

NA

Segment LCD

0

Minimum Operating Temperature (*C)

-55

Maximum Operating Temperature (*C)

1

2

5

Minimum Operating Voltage (V)

4

Maximum Operating Voltage (V)

5.5

High Voltage Capable

No

Specifications of Atmel AT89C5

1

Microcontroller: Flash Memory :

4

K Bytes

CPU

:8-Bit

Maximum Operating Voltage:6.6V

Maximum Ocsillator Frequency:

0

Hz to

2

4

MHz Internal RAM:

1

2

8 x 8-Bit Programmable I/O Lines:3

2

Timer/Counters:Two,

1

6-Bit Package of Atmel AT89C5

1

Microcontroller:

1

x Atmel AT89C5

1

Microcontroller