The device features 2KB of in-system reprogrammable Flash memory, allowing for easy and flexible programming and updates.
The device features 2KB of in-system reprogrammable Flash memory, allowing for easy and flexible programming and updates.
The 89C2051 includes 128 bytes of SRAM (Static Random Access Memory) for data storage and 512 bytes of EEPROM (Electrically Erasable Programmable Read-Only Memory) for non-volatile data storage.
The device operates at a maximum clock speed of 24 MHz, providing a high-performance processing capability.
| I/O Ports | The 89C2051 features 15 programmable I/O lines, including 12 bi-directional I/O ports and 3 output-only ports. |
The device supports asynchronous serial communication through its built-in UART (Universal Asynchronous Receiver-Transmitter) interface.
The 89C2051 has 11 interrupt vectors, allowing for efficient handling of interrupts and events.
The device operates at a low power consumption of 15 mA at 4 MHz.
The device can be used in industrial control applications, such as motor control, lighting control, and process control.
The 89C2051 is suitable for automotive applications, including dashboard control, body control, and infotainment systems.
The device can be used in consumer electronics, such as TV remote controls, audio systems, and gaming consoles.
Key Performance Characteristics
The 89C2051 can execute 1 million instructions per second (MIPS) at 24 MHz.
The 89C2051 features 2KB of Flash memory, 128 bytes of SRAM, and 512 bytes of EEPROM.
Package and Pinout
| The ATMEL 89C2051 is available in a 20-pin DIP (Dual In-Line Package) or a 20-pin SOIC (Small Outline Integrated Circuit) package. The pinout is as follows |
Power supply pin
Ground pin
Reset input pin
| XTAL1 | Crystal oscillator pin |
| XTAL2 | Crystal oscillator pin |
Clock input pin
Clock output pin
8-bit bi-directional I/O port
4-bit bi-directional I/O port
3-bit output-only port
UART receive data input pin
UART transmit data output pin
Conclusion
The ATMEL 89C2051 is a versatile and powerful microcontroller that offers a range of features and capabilities, making it suitable for a wide range of applications. Its low power consumption, high processing speed, and flexible programming capabilities make it an ideal choice for designers and developers.
ATMEL 89C2051 IC DocumentationOverviewThe ATMEL 89C2051 is an 8-bit microcontroller (MCU) from the Atmel AVR family, which is widely used in various embedded systems and Internet of Things (IoT) applications. This microcontroller features 2KB of flash memory, 128 bytes of RAM, and 512 bytes of EEPROM. It operates at a clock frequency of up to 24 MHz and has 15 programmable I/O lines.Pinouts and FeaturesThe ATMEL 89C2051 IC has a 20-pin DIP package with the following pinouts:| Pin | Function |
| --- | --- |
| 1-8 | Port A (PA0-PA7) - I/O lines |
| 9-13 | Port B (PB0-PB4) - I/O lines |
| 14-15 | VCC and GND - Power supply |
| 16 | XTAL1 - Crystal oscillator input |
| 17 | XTAL2 - Crystal oscillator output |
| 18 | RST - Reset input |
| 19-20 | SCK and MISO - SPI interface |Code ExamplesHere are three code examples that demonstrate how to use the ATMEL 89C2051 IC in different contexts:Example 1: Blinking LED Using Timer/CounterIn this example, we will use the Timer/Counter module to blink an LED connected to Port A, Pin 0 (PA0).```c
#include <avr/io.h>
#include <avr/interrupt.h>#define F_CPU 1000000UL // 1 MHz clock frequency
#define LED_PIN PA0int main(void) {
// Initialize Port A as output
DDRA |= (1 << LED_PIN);// Initialize Timer/Counter0
TCCR0 = (1 << CS01) | (1 << CS00); // Prescaler = 64
OCR0 = 249; // Set timer value for 1 Hz// Enable global interrupts
sei();while (1) {
// Toggle LED state
PORTA ^= (1 << LED_PIN);
}
}ISR(TIMER0_COMP_vect) {
// Timer/Counter0 interrupt handler
PORTA ^= (1 << LED_PIN); // Toggle LED state
}
```Example 2: SPI Communication with an External EEPROMIn this example, we will use the SPI interface to read and write data to an external EEPROM (e.g., AT24C02) connected to the SCK, MISO, and MOSI pins.```c
#include <avr/io.h>
#include <avr/sleep.h>#define F_CPU 1000000UL // 1 MHz clock frequency
#define EEPROM_SELECT PB0 // Chip select pin for EEPROMvoid spi_init(void) {
DDRB |= (1 << SCK) | (1 << MOSI) | (1 << EEPROM_SELECT);
SPCR = (1 << SPE) | (1 << MSTR) | (1 << SPR1) | (1 << SPR0);
}void spi_write(uint8_t data) {
SPDR = data;
while (!(SPSR & (1 << SPIF)));
}uint8_t spi_read(void) {
SPDR = 0xFF;
while (!(SPSR & (1 << SPIF)));
return SPDR;
}int main(void) {
spi_init();// Write data to EEPROM
PORTB &= ~(1 << EEPROM_SELECT);
spi_write(0x00); // Write command
spi_write(0x01); // Address
spi_write(0x02); // Data
PORTB |= (1 << EEPROM_SELECT);// Read data from EEPROM
PORTB &= ~(1 << EEPROM_SELECT);
spi_write(0x03); // Read command
spi_write(0x01); // Address
uint8_t data = spi_read();
PORTB |= (1 << EEPROM_SELECT);return 0;
}
```Example 3: UART Communication with a Serial TerminalIn this example, we will use the UART interface to send and receive data to/from a serial terminal (e.g., HyperTerminal) connected to the microcontroller's Tx and Rx pins.```c
#include <avr/io.h>
#include <avr/interrupt.h>#define F_CPU 1000000UL // 1 MHz clock frequency
#define UART_BAUD_RATE 9600void uart_init(void) {
UBRR = 12; // Set baud rate
UCSR |= (1 << RXEN) | (1 << TXEN);
UCSR |= (1 << RXCIE);
}void uart_send(char data) {
while (!(UCSR & (1 << UDRE)));
UDR = data;
}char uart_receive(void) {
while (!(UCSR & (1 << RXC)));
return UDR;
}ISR(USART_RXC_vect) {
char data = uart_receive();
uart_send(data); // Echo back received data
}int main(void) {
uart_init();while (1) {
// Receive and process data from serial terminal
}
}
```These code examples demonstrate the basic usage of the ATMEL 89C2051 IC in different contexts, showcasing its capabilities and versatility in IoT applications.