Electronic Components
Atmel At89c51 Microcontroller
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AT89C51 is an 8-bitmicrocontrollerand belongs to Atmels8051 family.ATMEL 89C51has 4KB of Flash programmable and erasable read only memory (PEROM) and 128 bytes of RAM. It can be erased and program to a maximum of 1000 times.
In 40 pin AT89C51, there are four ports designated as P1, P2, P3and P0. All these ports are 8-bit bi-directional ports,i.e., they can be used as both input and output ports. Except P0which needs external pull-ups, rest of the ports have internal pull-ups. When 1s 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 P0and P2are 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 likeserial communication, hardware interrupts, timer inputs and read/write operation from external memory.AT89C51 has an inbuilt UART for serial communication. It can be programmed to operate at different baud rates. Including twotimers& hardwareinterrupts, it has a total of six interrupts.
Features ofAtmel AT89C51 Microcontroller:
|
CPU |
8-bit 8051 family |
|
Architecture |
8051 |
|
Program Memory Size (Kbytes) |
4K Flash |
|
RAM (bytes) |
128 |
|
EEPROM/HEF |
Nil |
|
Pin Count |
40 |
|
Max. CPU Speed (MHz) |
24 |
|
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 16-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 I2C 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) |
125 |
|
Minimum Operating Voltage (V) |
4 |
|
Maximum Operating Voltage (V) |
5.5 |
|
High Voltage Capable |
No |
Specifications ofAtmel AT89C51 Microcontroller:
- Flash Memory : 4K Bytes
- CPU:8-Bit
- Maximum Operating Voltage:6.6V
- Maximum Ocsillator Frequency: 0 Hz to 24 MHz
- Internal RAM:128 x 8-Bit
- Programmable I/O Lines:32
- Timer/Counters:Two, 16-Bit
Package ofAtmel AT89C51 Microcontroller:
1 xAtmel AT89C51 Microcontroller
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